History Main / LongLostRelative

* ''Manga/SailorMoon'': [=ChibiUsa=]/Rini arrives and stays with the Tsukinos pretending to be a distant cousin. Everyone constantly compares her and Usagi/Serena. From their hair styles, their childish behavior, their love for Mamoru/Darien. It's eventually revealed that she's their daughter from the future and Really700YearsOld.
* ''Manga/SketDance'' dropped a shocking yet somehow logical bombshell when it was revealed that [[spoiler: Bossun and Tsubaki are twins [[TearJerker tragically separated at birth]]]]. Before TheReveal, several characters commented on the similarities between the two. Creepily, because of their constant bickering (read as BelligerentSexualTension) and amusing degree of being similar-yet-opposite, they had a whole contingent of shippers. [[{{Squick}} Not all of them gave up]] when [[SurpriseIncest the truth came out.]]
* ''Anime/{{Slayers}}'' plays with this; WordOfGod confirmed that Lina's first traveling companion, the flaky [[GoldfishPoopGang Naga the Serpent]], is in fact Gracia Ul Naga Seyruun, the first princess of Seyruun and the long-lost sister of one of Lina's later companions, [[RoyalsWhoActuallyDoSomething Amelia]]. They sort of meet three times in continuity: the ''Slayers Evolution-R'' anime had Naga's soul trapped in a suit of armor and became an ally for the group for five episodes, [[NonSerialMovie ''Slayers Premium'']] had Amelia be blasted away before Naga appeared, and the radio drama following the movie had them briefly meet, but Naga simply told Amelia (who didn't recognize her) that she was a friend of Lina's.
* A subversion in ''Anime/SpeedRacer''. Racer X knows he's the long lost brother, but no one else does. This is also true in TheMovie, wherein they made a plausible explanation for it because movie Speed wasn't quite as [[strike:stupid]] innocent as his anime counterpart.

** Subverted in ''ComicBook/Superboy1949'' #89 "ComicBook/SuperboysBigBrother". Superboy stops a rocket from crashes in Earth, and finds amnesiac boy inside. Circumstancial evidence leads Superboy to believe that unfamiliar boy -whom he calls Mon-El- is his older brother. Eventually, Mon-El gets his memory back and realizes that Superboy is mistaken, since they are not even from the same planet.

* ''ComicBook/KaZar'': Ka-Zar, Lord of the Jungle, is the long lost brother of deadly pirate the Plunderer, a fact initially only known to the Plunderer himself.

* ''ComicBook/TheMightyThor'': During the ''ComicBook/OriginalSin'' tie-in of ''ComicBook/LokiAgentOfAsgard'', ComicBook/{{Angela|AsgardsAssassin}} from the ''ComicBook/{{Spawn}}'' universe is revealed to be the older sister of Thor and Loki.

* ''ComicBook/{{Deadpool}}'': In ''ComicBook/Deadpool2013'', Deadpool discovers he has a daughter he didn't know about from earlier events. He tagged along with other heroes on a mission, hired by a woman to avenge her husband's death. Deadpool meets Carmelita, the woman's daughter, and there's an instant attraction. They get locked in a game-room together to be killed later, and Carmelita decides she wants to spend her last min of life "loving", so she and Deadpool get it on. The relationship comes to an end when she sees Deadpool's face for the first time, and runs away in disgust. However, she shows up later, having finally tracked down Deadpool, who hasn't responded to any of her letters about their baby, or child support. She quickly puts the child in Deadpool's arms, and he seems smitten, but quickly pushes them both away, saying the child is too beautiful to be his. After she and the baby are kidnapped, Deadpool goes to save them. Unfortunately, he finds Carmelita's corpse, along with all the others who were killed, and grieves about how it's his fault. His daughter isn't there -- her whereabouts unknown, and Deadpool would not meet her again for another 8 years.

* ''WesternAnimation/{{Coco}}'': Héctor turns out to be Miguel's actual great-great grandfather.

* Myth/ArthurianLegend: Morgan le Fay to Myth/KingArthur, who comes with extra disturbing quotient in the form of their mutual child he just sort of forgot about.

* ''ComicBook/{{Captain Marvel|MarvelComics}}'': After dying, Captain Mar-Vell has acquired a few offspring. [[ComicBook/YoungAvengers Hulkling]] was from a fling he had with the Skrull princess Annelle. Mar-Vell's lover Elysius used Mar-Vell's genetic material after his death to impregnate herself with Genis, and then she sped up his aging process. When Genis rebooted the universe, one change in the timeline was that Elysius did the same thing a second time and had a daughter named Phyla.

** ''ComicBook/WonderWoman1942'': Wonder Woman's a twin sister ComicBook/{{Nubia}} was stolen by their grandfather ComicBook/{{Ares|DC}} after creation and believed dead by the rest of her family until she and Diana met as adults.

* 4Kids editing of ''WesternAnimation/WinxClub'' provides an example of this trope being [[ExecutiveMeddling undermined by editing]]: The Trix exposit about the Dragonfire to Bloom. [[spoiler: Of their ancestors' attempt to take it, they say, "Your sister ruined everything by saving your life." This prompts Bloom to say, "Daphne?" But in the dub, the Trix never mention this, instead referring to Daphne as "the guardian of the flame", with Bloom saying "Daphne?" being cut out. It's rather awkward, since the first time it's indicated that they're sibs in the dub is when she's looking at her family tree in S2.]]

* ''ComicBook/TeenTitans'': ComicBook/{{Raven}} finds out she is not the only living child of the demon Trigon. She discovers her father Trigon mated with six other women giving her the younger half-brothers Greed, Gluttony, Wrath, Lust, Envy and Sloth (Raven represents Pride). Post-Flashpoint Raven has three older half-brothers via Trigon named Belial, Ruskoff and Suge. When Trigon was first introduced it was implied that over the ages he has had hundreds of children but they had been killed by his enemies.

* ''Amazing Comicbook/SpiderMan: Family Business'' introduces Peter Parker's sister, Teresa Parker.
* In some continuities, ComicBook/{{Aquaman}} has a long-lost brother in [[spoiler: Orm, aka Ocean Master]].
* In ''ComicBook/{{Cable}}'', Mr. Tolliver reveals himself as Tyler Dayspring, Cable's son.
* After dying, the Marvel version of ComicBook/{{Captain Marvel|MarvelComics}} has acquired a few offspring. [[ComicBook/YoungAvengers Hulkling]] was from a fling he had with the Skrull princess Annelle. Mar-Vell's lover Elysius used Mar-Vell's genetic material after his death to impregnate herself with Genis, and then she sped up his aging process. When Genis rebooted the universe, one change in the timeline was that Elysius did the same thing a second time and had a daughter named Phyla.
* Cloak from ''ComicBook/CloakAndDagger'' had a twin sister named Anna. We were never given much detail on why she wasn't raised with Cloak and his other siblings and if Cloak even knows he has a twin sister.
* The 19th issue of ''Cartoon Network Action Pack'' had a ''WesternAnimation/CodenameKidsNextDoor'' story titled "Operation: H.I.S.T.O.R.I.E.", which revealed that Numbuh Four's father Sydney Beetles and the Toiletnator were twin brothers who were separated from each other years ago.
* ''ComicBook/{{Deadpool}}''. The title character discovers he has a daughter he didn't know about from earlier events. He tagged along with other heroes on a mission, hired by a woman to avenge her husband's death. Deadpool meets Carmelita, the woman's daughter, and there's an instant attraction. They get locked in a game-room together to be killed later, and Carmelita decides she wants to spend her last min of life "loving", so she and Deadpool get it on. The relationship comes to an end when she sees Deadpool's face for the first time, and runs away in disgust. However, she shows up later, having finally tracked down Deadpool, who hasn't responded to any of her letters about their baby, or child support. She quickly puts the child in Deadpool's arms, and he seems smitten, but quickly pushes them both away, saying the child is too beautiful to be his. After she and the baby are kidnapped, Deadpool goes to save them. Unfortunately, he finds Carmelita's corpse, along with all the others who were killed, and grieves about how it's his fault. His daughter isn't there -- her whereabouts unknown, and Deadpool would not meet her again for another 8 years.
* During the "Elegy" story arc of ''Detective Comics'', it's revealed that [[spoiler:ComicBook/{{Batwoman}}'s nemesis Alice is actually her twin sister Beth, who had been kidnapped as a child and believed dead]]. This revelation [[HeroicBSOD is not taken well]].
* In the earliest stories ComicBook/{{Diabolik}} had a SecretIdentity as Walter Dorian, and when it was revealed that [[TheRealRemingtonSteele there was an actual Walter Dorian that Diabolik had replaced because they looked identical]] it was theorized, in and out of universe, that they were indeed related. Eventually Eva, after being captured by a journalist with "flexible etics", bartered her freedom with the fact they were indeed twins... And then [[SubvertedTrope provided evidence they weren't]] to said journalist's competition.

* In a ''Franchise/GreenLantern'' story published in ''ComicBook/ComicCavalcade'', the rail magnate John Cashmere is reunited with his long lost son Dick after his son is fully grown with no knowledge of his birth father, with a very distinct birth mark enabling their reunion.
* ComicBook/IronFist's father Wendell Rand married a K'un Lun woman named Shakari and had a daughter with her named Miranda. Miranda's mother was killed by the H'ylthri and a distraught Wendell returned to earth, where he eventually married Heather Duncan and shortly thereafter they had Daniel. Miranda would later take on the identity Death Sting.
* After the events of the ''ComicBook/MarvelNOW'' relaunch, ComicBook/IronMan learned he secretly had an older brother named Arno Stark.

* In Creator/MarvelComics, Ka-Zar, Lord of the Jungle, is the long lost brother of deadly pirate the Plunderer, a fact initially only known to the Plunderer himself.
* In the ''ComicBook/New52'' reboot, ComicBook/GreenArrow discovers that he has a younger Japanese half-sister named Emiko Queen.

* During the ''ComicBook/OriginalSin'' tie-in of ''ComicBook/LokiAgentOfAsgard'', ComicBook/{{Angela|AsgardsAssassin}} from the ''ComicBook/{{Spawn}}'' universe is revealed to be the older sister of [[ComicBook/TheMightyThor Thor]] and Loki.
* In ''ComicBook/PowerPack'' we are introduced to a man named Mr. Raymond. It is never fully confirmed who he is but it's strongly hinted that he is the Golden Age superhero Toro (who was presumed dead) and the father of ComicBook/{{Nova}} (Frankie Raye) who was a herald of Galactus. In the meantime a past version of Toro has come to the present and Frankie was thought dead, before she returned.

* Satana Hellstrom may count, though when her brother Daimon (Son of Satan) Hellstrom finally met her again, she was kinda sorta ''mistaken'' for being on the other side. (And weirdly, even though they hadn't met since being separated as young children, he'd previously had hallucinations about her with her correct current appearance and costume.)
* In ''ComicBook/{{Shazam}},'' [[TheChosenOne Billy Batson]] has a twin sister, Mary, who was HappilyAdopted by a wealthy couple after their parents died. Finding her results in him joining their family and her becoming his DistaffCounterpart, ComicBook/MaryMarvel.
* ComicBook/SilverSurfer discovered that his father Jartran Radd fathered an illegitimate child named Fennan Radd after the death of Norrin's mother Elmar. It's unclear if this is actually true as Zenn-La was retconned as being destroyed by the Other and recreated as an illusion by Galactus to comfort the Silver Surfer.
* ComicBook/SpiderGirl (Mayday Parker), last we saw her, still was not aware that Darkdevil is her cousin (son of her father's clone).

* Llyra originally passes Llyron off as her son with [[ComicBook/SubMariner Namor]]. This is later found out to be a lie but Llyron's true father turns out to be Namor's half-nephew Leon. Turns out Namor's father Leonard had a son with a human woman named Lawrence [=McKenzie=] who fathered Leon (Black Moray) who fathered Llyron.

** In ''Comicbook/SupermansPalJimmyOlsen2019'', Lex Luthor discovered compelling evidence that he and Jimmy Olsen are actually distant cousins by way of a star-crossed romantic tryst between his ancestor Hannah Alexandria Luthor and Jimmy's ancestor Jimberly Jimmington Olsen, and it's from this relationship that Lex's former red hair originates.
* ComicBook/{{Raven}} from ''ComicBook/TeenTitans'' finds out she is not the only living child of the demon Trigon. She discovers her father Trigon mated with six other women giving her the younger half-brothers Greed, Gluttony, Wrath, Lust, Envy and Sloth (Raven represents Pride). Post-Flashpoint Raven has three older half-brothers via Trigon named Belial, Ruskoff and Suge. When Trigon was first introduced it was implied that over the ages he has had hundreds of children but they had been killed by his enemies.
* In the ComicBook/UltimateMarvel universe the teenager Jimmy Hudson was revealed as the son of Wolverine and Magda (who is also the mother of Quicksilver and the Scarlet Witch, with Magneto). It was late for him to meet his biological father or his sister, who were already dead by then, but he met his brother Quicksilver in ''ComicBook/UltimateWolverine''. He also saw his biological mother briefly, but she escaped after it, and as he was HappilyAdopted he had no major interest to seek her anyway.
* In ''ComicBook/{{Wolverine}}'', Dog Logan is revealed as Logan's forgotten half-brother. Eventually, the two meet in modern day.
* ''Franchise/WonderWoman'':

* ''Franchise/XMen'':
** Charles Xavier has an EvilTwin sister he didn't know about, who says he tried to kill her in the womb.

** ComicBook/{{Storm}} has no siblings, but she does have a long-lost branch of her family on her mother's side that was {{Retcon}}ned into existence to help justify her going back to Africa so she could marry the ComicBook/BlackPanther.
** Played fairly straight with Nightcrawler's half-brother Graydon Creed (the non-mutant son of ComicBook/{{Mystique}} and ComicBook/{{Sabretooth}}). Rogue also has a few "adoptive" relatives on the side of her other mother, Destiny, including young X-Man Blindfold.

* Literature/{{Mahabharata}}: Much to their dismay, Arjun and his brothers come to find that [[TheDragon their scheming cousin's right hand man Karna]] is actually ''their older brother'', whom their mother abandoned after giving birth to him out of wedlock, leaving him to be brought up by low-ranking commoners & receive much mockery for his supposedly "low birth" despite [[TheAce his prowess as a warrior]]). They only find out after they've killed him in [[SuccessionCrisis a bloody, costly war of succession]].

* ''WesternAnimation/SpongeBobSquarePants'': The episode "Big Sister Sam" reveals that Patrick has a long lost older sister named Sam as Patrick mentions to [=SpongeBob=] that they were lost in the surf when they were kids.

* Done twice with [[SpoonyBard Elan]] in ''Webcomic/TheOrderOfTheStick''. Very early on the group encounters [[SdrawkcabName Nale]], Elan's long-lost EvilTwin who proceeds to betray the group and become one of the comic's major recurring antagonists. The second instance, much later in the story, is when they meet [[spoiler: Elan's (and Nale's) father Tarquin, who is [[ManBehindTheMan puppeteering the leadership]] of the various Empires of the Western Continent along with his old adventuring buddies. He turns out to be just as evil, and far more dangerous, than Nale, and is in fact kills his son after Nale insists on wanting nothing to do with him.]]

!!Examples:

[[folder:Literature]]
* In the ''Literature/BlackBlade'' series, protagonist Lila Merriweather is the first cousin of [[spoiler:Deah Draconi, the BigBad's WhiteSheep daughter]].
* Jerin and Princess Ren in ''Literature/ABrothersPrice'' find out that they are third cousins, sharing great-great-grandmothers. His grandfather was thought to be lost by family, but instead had been abducted and married to his grandmothers. This relation is distant enough that it does not [[KissingCousins hurt the romance]], and in fact the RoyalBlood that Jerin thus possesses means it's possible for them to marry.
* ''Literature/BudNotBuddy'' has an orphan GeneHunting for his DisappearedDad, who he thinks is famous bandleader Herman E. Calloway. [[spoiler:He is eventually united with Calloway, who turns out to be not his father, but his grandfather. His mother ran away from him in her late teens, and her father never learned what happened to her until Bud showed up.]]
* ''Literature/{{Catwings}}'': In ''Catwings Return'', Harriet and James return to the city. They find a lost winged kitten who turns out to be their little half-sister.
* ''Literature/TheChroniclesOfDorsa'': Joslyn finds out in book two that her older sister Tasmyn, whom she had been separated from as a girl, is still alive when they meet while she's dreamwalking.
* Played to a ridiculous level in the {{Wuxia}} ''Literature/DemiGodsAndSemiDevils'' with the protagonist's father, Duan Zhengchun, being a big case of TheCasanova. ''Every single'' {{Love Interest|s}} his son, Duan Yu, meets in his journey turns out to be his half-sisters. [[spoiler: Though this is subverted later on as Duan Yu isn't Zhengchun's son, thus resulting in Duan Yu [[MarryThemAll marrying all of them]].]]
* In ''Literature/DoctorSleep'', [[spoiler:Danny and Lucy]] discover they're half-siblings, sharing their father, whom the younger sibling never met.
* In ''Literature/DoctorZhivago'', Yuri Zhivago learns that his deadbeat father had an illegitimate son with Princess Stolbunova-Enritsi named Yevgraf. Later on, Yevgraf ends up being an important but enigmatic character, helping Yuri and his loved ones to escape most of the chaos brought on by the Russian Revolution.
* ''Literature/TheDresdenFiles'':
** Harry Dresden discovers fairly early in his adventures that he has a long lost half-brother, [[spoiler:Thomas]].
** In ''Literature/{{Changes}}'', he discovers that he has a long lost [[spoiler:daughter and grandfather]] as well. Where it gets tricky is that it makes [[spoiler:Ebenezar ''Thomas[='=]'' long-lost grandfather]], something neither of them are aware of (and might not be happy to find out). Harry's pretty careful about who he tells what: as of ''Literature/SkinGame'', nearly everyone knows [[spoiler:he has a daughter]], but good luck keeping track of who knows about [[spoiler:Ebenezar and/or Thomas]].
* In ''Literature/EmpireOfTheEast'', the Lady Charmian's long-lost younger sister is unknowingly serving her as a handmaiden. Each of them lost their memories of the other as the result of encountering a demon as young girls. [[spoiler:Well, "encountering" might be too mild; their father ''gave them to it'' as his pledge of loyalty- the demon allowed them to live for its own reasons...]]
* In ''Literature/EndersShadow'' (the parallel novel to ''Literature/EndersGame'') we find out the backstory of Bean, a super-smart little genetic experiment who was kidnapped as an ''embryo'', escaped captivity as a baby, and made it to the orbital battle school as a small child. He managed to forge a real friendship with exactly one other person in the school, who turns out to be the son of the people whose embryo was stolen, meaning Bean sought out and befriended his long-lost brother.
* In ''Literature/EndoAndKobayashiLive The Latest on Tsundere Villainess Lieselotte'', [[spoiler:Fiene]] is actually the illegitimate daughter of Lieselotte's father's older brother August and his fiance Elizabeth, making her and Lieselotte first cousins. The backstory is this: Elizabeth's parents vetoed her marriage with her fiance since he is dying, but the two decided to [[SomeoneToRememberHimBy try to have their children anyway]]. After August's death and Elizabeth's pregnancy with August's child, she ran away to protect her daughter from her family, which is why neither girl ever learned about their family ties until Elizabeth arrives at the family manor. Lieselotte has her father adopt Fiene into the family to ensure her protection.
* ''Literature/FirstLight'': [[spoiler:Peter and Thea are cousins. Peter's mother left Gracehope years earlier before coming back]].
* In ''Literature/FiveKingdoms'': ''Crystal Keepers'', The Hunter that is working for the High Shaper is actually [[spoiler:Hunter Randolph, the older brother of the main protagonist, Cole. He actually got sucked into the Outskirts a couple of years before Cole, which is why Cole has no memory of him. (When somebody gets sucked to the Outskirts from Earth, those closest to them on Earth forget that they ever existed.) Of course, when Hunter tells him this, he believes it to be an elaborate ruse at first, especially since Hunter is working for the enemy. Hunter, however, provides enough evidence to make it very doubtful to both Cole and the readers that he could be anything but Cole's brother and then backs it up with deeds after he verifies that the shady stuff that Cole tells him about the High Shaper that the High Shaper had been hiding from him is true]].
* In ''The Five Little Peppers and How They Grew'' it turned out that the Pepper children's mother and their rich benefactor's son-in-law were cousins.
* The plot of ''Literature/FortHope'' largely revolves around the protagonist, Greg, trying to get to know his long lost relatives. His love interest also ends up learning about relatives that she never knew she had.
* In ''Literature/TheGirlFromTheMiraclesDistrict'', Nikita discovers that [[spoiler:she and Ture]] are twins.
* ''Literature/GoblinsInTheCastle'': ''Goblins on the Prowl'' has this as its big reveal -- [[spoiler:Fauna turns out to be Gertrude, the Baron's older sister who went missing when he was a baby, and rightful Lady of the Castle. It's as much a surprise to her as it is to the others, as she'd lost her memories when she was trapped in an unaging state. The Baron, for his part, is very happy to have her back.]]
* In the eleventh ''Literature/HaruhiSuzumiya'' light novel, [[spoiler: [[BigBad Fujiwara]] claims to be [[{{Moe}} Mikuru's]] younger brother]]. The alleged sibling denies it, but the two of them seem to have some history together, [[spoiler: though the versions of them we see are from different timelines]].
* In ''Literature/{{Havemercy}}'' Thom eventually realizes that [[spoiler:Rook]] is his brother, leading to a lot of protest among fans who ''insist'' that their UST is undeniable (and it really is...).
* ''Literature/TheHeroesOfOlympus'':
** In this ''Literature/PercyJacksonAndTheOlympians'' sequel series, it is discovered that [[spoiler:Jason is Thalia's little brother. And no, not just because they share the same father. They're actual, full-blooded siblings]].
** Hazel is Nico's sister and Frank turns out to be a descendant of Poseidon, so Percy and Tyson adopt him as their brother.
** Leo is related to Sammy Valdez, Hazel's boyfriend from back during World War 2--specifically, he is Sammy's great-grandson.
** Heracles and Chrysaor are Jason and Percy's respective half-brothers.[[note]]Though it's not difficult to figure it out with the mythological background of the former two in mind, they'd never met before ''Mark of Athena''.[[/note]] They try to kill each other.
* ''Literature/TheJekyllLegacy'' (by Creator/RobertBloch and Andre Norton): Variant in that the relation is only discovered posthumously -- the plot kicks off when Hester Lane, recently arrived in London from Canada (accompanying a girl who was being sent overseas to live with family) discovers that her late father had changed his name before she was born -- he was originally Leonard ''Jekyll'', estranged brother of the missing (actually deceased) [[Literature/TheStrangeCaseOfDrJekyllAndMrHyde Dr. Henry Jekyll]], making Hester the only blood heir to Dr. Jekyll's estate.
* ''Literature/TheKiteRunner'' reveals that [[spoiler:Hasaan is Amir's half-brother]] in a climactic reveal.
* In ''Literature/TheLostYearsOfMerlin'', Emrys ([[MeaningfulRename i.e., Merlin]]) first gets a LukeIAmYourFather [[spoiler:from Stangmar]] in the first book, and in the second finds out that [[spoiler:his friend Rhia]] is his sister.
* In Creator/JaneAusten's ''Literature/LoveAndFreindship'', Laura lucks on her grandfather, followed by a positive cascade of discoveries.
* The ''Literature/MollyMoon'' series is full of these. In the course of four books, [[spoiler:Molly goes from having no family at all to discovering her mom (Lucy), dad (Primo Cell), her evil uncle (Cornelius), twin brother (Micky), and half-siblings through adoption (Sinclair and Sally Cell)]]
* ''Literature/MoojagAndTheAuticodeSecret'': Nema's older brother Monzi went missing ten years ago, around the time of the [[FloodedFutureWorld Surge]]. [[spoiler:Because of his autism, he was taken to Gajoomdom and made to work as a coder with the other auts. He now goes by Moojag, the man who originally invited the protagonists to Gajoomdom.]]
* ''Literature/TheMortalInstruments'':
** [[spoiler: Valentine Morgenstern is Clary’s biological father]].\\
\\
[[spoiler:Jace and Clary end up being siblings... though not before they've sort of fallen in love with each other. Oops...]]\\
\\
[[spoiler:Once you get to ''City of Glass'', you find out that Jace and Clary ''aren't'' related, and that Clary's actual brother is Sebastian]].
** Amatis Herondale to [[spoiler:Luke, more or less, although it's more of the fact that they're estranged siblings and Luke's afraid that she'd blame him for her divorce]].
* In the first book of ''Literature/TheObsidianTrilogy'' by Creator/MercedesLackey and James Mallory, Kellen Tavadon finds that Idalia, the person who nurses him back to health, is his sister (and that their father gave him LaserGuidedAmnesia to avoid bothersome questions from a six-year-old).
* ''Literature/OfFireAndStars'': Queen Invasya of Zumorda it turns out is related to Dennaleia (whose maternal grandmother had been Zumordan) through her son who had lived in Havemont, Dennaleia's home country. This probably makes her Dennaleia's great or great-great-grandmother. She learns the queen wants her to be her heir later.
* ''Literature/OldKingdom'' series: Turns out Sabriel has a [[spoiler:half-sister]], which is a very good thing considering that neither of her kids is Abhorsen material.
* ''Literature/{{Parzival}}'': Feirefis, Parzival's Moorish long-lost half-brother and ancestor of Prester John is only one of several long-lost relatives in Wolfram von Eschenbach's epic poem, where EveryoneIsRelated.
* ''Literature/TheRedVixenAdventures'': In ''Shadow of Her Sins'', Alinadar, who was enslaved by pirates at the age of six, meets an older brother she didn't remember she had.
* In ''Literature/{{Scaramouche}}'', the HeroicBastard Andre-Louis Moreau gets entangled in a feud with the villainous Marquis de La Tour d'Azyr, who is revealed at the climax to be Andre's biological father. The Marquis is as shocked by the revelation as Andre is; he'd known that the woman he seduced had gotten pregnant, but she'd told him that the child didn't survive being born.
* The Baudelaire siblings encounter two of a set of triplets in ''Literature/ASeriesOfUnfortunateEvents'' -- the third triplet is a Long Lost Sibling who eventually reunites with his brother and sister.
* The titular character in ''Literature/SirAproposOfNothing'' discovers he has a long-lost sister - not quite in time to escape BrotherSisterIncest, but at least to escape marrying her. Unfortunately, he doesn't tell her, which results in her hating him for dumping her so unceremoniously.
* In the second ''Sky Jumpers'' book, ''Literature/ForbiddenFlats'', Luke, a traveler who agrees to take a group from White Rock (which includes Hope, Aaren, and Brock) to the town of Heaven's Reach, is discovered to be [[spoiler:the brother of Hope's birth mother, making him her uncle]].
* In Literature/{{Spartan}}, we have Talos and Brithos. Talos was [[DaddyHadAGoodReasonForAbandoningYou abandoned by his father]] when he was a baby, due to his city-state's law that every boy who was born weak or deformed die from exposure. Years later, [[spoiler: the two boys meet again and they develop a SiblingRivalry]]. [[spoiler: They never learn the truth, until the battle at Platea]].
* ''Literature/{{Spellbent}}'': Jessie Shimmer finds out she has multiple long lost relatives ([[spoiler:her father Ian]] and [[spoiler:her older brother Randall]]) in ''Shotgun Sorceress''.
* Arthur Spiderwick is the long lost DisappearedDad of ''Literature/TheSpiderwickChronicles''. The same is true for TheMovie.
* ''Franchise/StarTrek'': In the [[Literature/StarTrekNovelVerse novel]] ''The Captain's Daughter'' Hikaru Sulu had sex with a woman he knew as Ling Sui. Even though they were only together one time, it was enough for Ling Sui to become pregnant with a girl she named Demora. Ling Sui - whose real name was Susan Ling - kept the news that Sulu had a daugther with her from him but did identify Sulu as Demora's next of kin in her will. When Ling died of Sakuro's disease Starfleet was informed. Dr. [=McCoy=] did a genetic test and confirmed Demora was Sulu's daughter. Sulu decided to turn down the first officer job he was offered on the USS ''[[Recap/StarTrekTheNextGenerationS5E18CauseAndEffect Bozeman]]'' in order to raise Demora.
* ''Franchise/StarWarsLegends'':
** Something like this happens in the ''Literature/BlackFleetCrisis''. In one of the two ultimately pointless major plotlines, Luke meets a woman who claims to be close friends with his mother. Apparently a lot of people claim that kind of thing, but he believes this one, since she's Force-sensitive. But she's part of a sect of extremely strict {{Actual Pacifist}}s and she gives him a bunch of [[SecretTestOfCharacter Secret Tests of Character]] to see if his mother would approve of him, and since Luke readily uses weapons to defend himself and her, he fails all of them. And then it turns out that no, she was lying about knowing his mother and apparently just wanted a chance to moralize on Luke.
** During the ''Literature/DarkNestTrilogy'' Jacen Solo and Tenel Ka have a daughter they eventually name Allana. They keep Jacen's identity as the father secret even from Han and Leia. As Jacen fell to the dark side of the Force he kidnapped Allana to force Tenel Ka to provide Hapan fleets to him. Han and Leia helped rescue Allana. Back on board the ''Millenium Falcon'' the three realize they are related to each other.
--->'''Allana Solo''': You're Leia Organa Solo. You're Jacen's mommy. He is my daddy."\\
'''Leia Organa Solo''': I know. I am your grandmother.\\
'''Han Solo''': Hi, sweetie; I'm your grandfather.
* In the first ''Literature/{{Survivor|Dogs}}s'' book, the street-dog Lucky is reunited with his housepet sister Bella. The two were separated as pups when they were taken into different households.
* ''Literature/TalionRevenant'': [[spoiler:Marana]] encounters her long-lost twin sister on a mission, which due to the circumstances drives her insane.
%%* ''Literature/{{Theatrica}}''
* ''Literature/{{Thora}}'': In the first book, Thora learns that [[spoiler:Dottie Greenberg]] is her DisappearedDad's mother and her grandmother, and [[spoiler:Flossie and Lottie are her great-aunts]]. She's delighted to finally have an extended family.
* In ''Literature/TheVampireDiaries: Midnight'' it is revealed to Meredith Sulez, by her parents no less, that she has a twin brother who was kidnapped by [[BigBad Klaus]] when she was just a baby. [[spoiler: She also discovers that she is a type of vampire with kitten teeth.]]
* ''Literature/WarriorCats'': Scourge is the half-brother of Firestar through their father Jake. Scourge serves as his sibling's evil foil. They were both born housecats and they both abandoned their owners, but their paths were different. Scourge and Firestar are unaware of their relationship. Scourge ends up [[spoiler:taking one of Firestar's lives]], which Firestar [[spoiler:[[SiblingMurder returns]] by killing Scourge]] for trying to kill his (and unknowingly Scourge's) nephew Cloudtail.

[[folder:Live-Action TV]]
* On ''Series/TwentyFour'' the nemesis who appears to have orchestrated most of the events of the fifth season is revealed in the sixth to be Jack Bauer's estranged (and never before mentioned) brother Graem who was also being manipulated by their father.
* On ''Series/{{Alias}}'', Sydney discovers a long-lost sister, Nadia, at the end of Season 3. Said sister goes on to: [[spoiler: become a series regular at the start of Season 4, fall into an [[PutOnABus incurable]] [[ConvenientComa coma]] by the end of Season 4, and is KilledOffForReal in Season 5]]. A later episode reveals Nadia had another half-sister who was already deceased. Arvin and his wife Emily had a daughter named Jacqueline but she died in infancy. This was partly what triggered Arvin's obsession with the works of Milo Rambaldi.
* ''Series/AlmostFamily'': Due to Leon's fraud, it turns out that Julia, Amanda, and Edie along with all the many other children he's fathered are this for each other. Much of the plot involves them meeting each other, forging bonds and continually meeting yet another long-lost half-sibling.
* ''Series/TheAmazingRace'': Season 34 of the American series features a long-lost set of identical twins, Molly and Emily. Both were adopted as babies from Korea and only found out about each other the year previously when Emily’s daughter did a DNA test and Molly popped up as a close relative.
* ''Series/{{Arrow}}'':
** Thea Queen finds out that her father is not Robert Queen, but Malcolm Merlyn, which means that Tommy is her half-brother. The catch is that by the time she learns this, Tommy is already dead.
** In Season 7, Oliver learns that while his mother was having an affair with Malcolm, his father was having an affair with a Japanese woman named Kazumi Adachi, who conceived a daughter, Emiko. Unlike Thea however, Emiko was raised in poverty, causing her to become TheResenter towards the Queen family.
** Oliver's children, William Clayton and Mia Smoak, don't learn about their relationship until adulthood, as the latter's existence is a secret known only to select people in Oliver's inner circle, while William was raised by his grandparents, who disliked Oliver's vigilantism.
* ''Series/AsTheWorldTurns''.
** Subversion: A lot of people expected Reid to be revealed as a relative of John Dixon, given their similarities, but the only relative revealed was Reid's uncle, as both his parents were dead.
** [[PlayingWithATrope Played straight]] with Gabriel (Craig's illegitimate son), Liberty (Brad's daughter conceived when he was a teen), Rose (Lily's twin sister). DoubleSubversion with Jade, who only [[CoattailRidingRelative pretended to be Rose's long lost daughter to get money from Lily]] before finding out she actually was.
* ''Series/Batwoman2019'': In Season 3 Ryan discovers she has a half-brother by her birth mother.
* On ''Series/BeverlyHills90210'' Donna finds out her cousin Gina is also her half-sister. Gina and Donna share the same father and their mothers are sisters (which would also make them three-quarter siblings).
** Dylan finds out after his father Jack's death that Jack fathered an illegitimate daughter named Erica. Many years after his father's death he finds out his father's death was staged and that he is remarried living under an assumed name and that he has a young son named Jack.
** Steve always knew he was adopted. When he finds his biological mother's father he also learns a surprising secret. His adopted father was his biological father all along. His father also had 2 other sons Austin and Ryan.
** Erin Silver isn't Kelly Taylor's only half-sibling. On her father's side she has a half-sister named Joy.
* Howard from ''Series/TheBigBangTheory'' discovers he has a half-brother, the product of a relationship his father had after he walked out on Howard and his mother.
* ''{{Series/Bonekickers}}'': It's revealed that Vic is Magwilde's half-sister, as they share the same birth mother. This is mostly unexplored due to the series getting cancelled
* ''{{Series/Bones}}'':
** Brennan's parents disappeared when she was young, causing her to be put into foster care and become estranged from her older brother Russ (he was too old for foster care but too young to care for her himself). She's reunited with her father and brother during the course of the series and, [[PlayingWithATrope if you want to stretch the definition a bit]], discovers that a set of remains that's been in Limbo since she got to the Jeffersonian belongs to her mother.
** Brennan’s dad invited her cousin to come for Christmas. Brennan hadn’t met her before.
** Hodgins finds out that he isn’t an only child like he always thought. He has a brother, Jeffery, who lives in a mental institution. Jeffery has a schizoaffective disorder that causes him to have violent outbursts and they worried for baby Jack’s safety. Probably justified given families in his parents’ time were told to basically forget that institutionalized children existed...even other children weren’t always told. Plus they were a wealthy, well known family and might have considered Jeffery a dark spot on their reputation.
* On ''Series/BoyMeetsWorld'', Shawn runs into his long-lost half brother Jack when Jack arrives in Philadelphia to go to college. Shawn knew he existed before this but they were so estranged that none of the other main characters (or the audience) knew about him.
* ''Series/BurdenOfTruth'': Luna turns out to be [[spoiler:Joanna's half-sister on her father's side]].
* ''Series/Charmed1998'':
** The girls' father is introduced in this manner. He comes to Prue to anonymously get an heirloom ring appraised and waits for her to recognize it before revealing his identity.
** This trope is the only thing that saved the show after Creator/ShannenDoherty left and her character, Prue, was KilledOffForReal. In the first episode of the fourth season, Piper and Phoebe find out that the affair their mother had with their Whitelighter ([[ArcWelding which had fortunately been established a season and a half earlier]]) led to the birth of their younger half-sister, Paige.
** The sisters impersonate their own long lost cousins in the first few episodes of the eighth season.
* ''Series/ChasingLife'': Natalie is the half-sister of April and Brenna due to the affair their father had, whom they don't meet until after he dies. It turns out that their mother and grandparents already knew about Natalie though.
* ''Series/CityOnAHill'': Jenny learns of her long lost half brother only well into adulthood, as he was born due to a secret affair her father had.
* Mac Taylor meets a young man in Season 3 of ''{{Series/CSINY}}'' who is revealed to be his stepson. His wife got pregnant in high school and placed the boy up for adoption. She talked about finding him but died on 9/11. Though Reed initially rebuffs Mac's attempt at a connection when he learns Claire is dead, the two do eventually build a friendship.
* When the vampiric Barnabas Collins introduced himself to the Collins family on ''Series/DarkShadows'', he passed himself off as a long-lost cousin from the "English branch of the family". Strictly speaking that's absolutely true, just not quite how the Collins family took it.
* A recurring theme on soap operas. One prime example is ''Series/DaysOfOurLives'' villain Stefano, who over the course of the show has been revealed as the long lost biological father of Tony, Renee, Megan, Benjy, Lexie, Ej, Chad and the adoptive father of Kristen and Peter. In the end Tony turned out not to be his.
* Turns out that ''Series/{{Dexter}}'' has a [[spoiler:brother]] he never knew about, who turns out to be the [[spoiler:Ice Truck Killer of the first season]].
* The ''Series/{{Dinosaurs}}'' episode "Into the Woods" had Roy Hess reveal that he was separated from his father Les at a young age. Near the end of the episode, he meets an elderly Tyrannosaurus named Les who mentions being separated from his son Roy years ago. The episode ends before the two make the connection.
* ''Series/DoctorWho'': In [[Recap/DoctorWhoS30E7TheUnicornAndTheWasp "The Unicorn and the Wasp"]], the villain is the secret illegitimate son of [[spoiler:Lady Eddison]], who had given him up after he was born to avoid the scandal.
* ''Series/DueSouth'''s Constable Benton Fraser meets his half-sister in the show's penultimate episode.
* In Season 4 of ''Series/{{Elementary}}'', Joan meets her younger half-sister Lin. She originally met Joan as a client however Joan learned that they shared the same original surname ("Yeun"). Lin however had never intended on telling Joan of their relationship and only came to her for help.
* ''Series/{{The Flash|2014}}'': In season 2, Iris and Joe learn that Francine was pregnant when she left Joe, which means Iris has a brother she never knew about. Said brother is [[Characters/TheFlashWallyWest Wally West]], who becomes a speedster like Barry.
* In the pilot episode of ''Frankie Drake Mysteries'', the title character learns the industrialist's wife she's investigating is actually her mother, who "died" when she was four years old.
* ''Series/GameOfThrones'': In the sixth season finale it is revealed that [[spoiler:Jon Snow's real parents are Lyanna Stark and Rhaegar Targaryen. This makes Daenerys Jon's aunt, and Maester Aemon his great-great-uncle. His presumed father Ned Stark, is actually his uncle, and his presumed Stark half-siblings are actually his first cousins]]. Daenerys' poor mother Queen Rhaella had ''seventeen years'' of miscarriages and still-births between Rhaegar and Viserys, and then another eight-year gap before conceiving Dany. Rhaella finally gave birth to her only living daughter Daenerys approximately 8 to 9 months after [[spoiler: Lyanna Stark gave birth to her son Jon, resulting in Jon being slightly older than Daenerys.]] Dramatically enough, Maester Aemon and [[spoiler: Jon]] bonded over their families being in trouble (Aemon with his Targaryen family and [[spoiler: Jon with his Stark family]]) and wanting to help them, driven by their love for their families and anguished by their Night's Watch vows — all the while not knowing that [[spoiler: they share their own family tie via their Targaryen blood.]]
* ''Series/GhostsUK'': [[spoiler: {{Subverted}}. A woman named Lucy appears in the episode "A Lot To Take In" claiming to be Alison's long-lost sister from a previous relation that her father had. However, it is revealed in the last episode of the season that she was only pretending so she can take Alison's money.]]
* On ''Series/TheGoldenGirls'':
** Blanche's husband George died of a heart attack before the events of the series. During the series she encounters a man named David who reveals that he is the son of George and was conceived during George's affair with another woman. Blanche does not take the news well.
** Later, Rose meets a monk who turns out to be her birth father.
* In Season 2 of ''Series/{{Gotham}}'' Oswald meets his long-lost father [[spoiler:at his mother's grave]]. His father didn't know he had a son until that moment.
* ''Series/{{Heroes}}'':
** Two opposing factions played on [[spoiler: Gabriel Grey]]'s mental issues to manipulate him. The vehicle they used to do this? [[SubvertedTrope They lied]], telling him he was a long lost family member.
** A better example lies in Alice, [[spoiler:Angela Petrelli]]'s [[YouDidntAsk never-before-mentioned]] sister.
** Eventually Sylar does have real long lost relative issues. He tracks down Martin Gray the father that abandoned him and discovers that Martin is only his uncle. Sylar's real father Samson Grey killed Sylar's mother and sold their son to his brother Martin and Martin's wife Virginia who was infertile.
* In ''Series/{{House}}'', a married couple who grew up next door to each other learn that they are in fact half-siblings. Not quite long-lost, but close.
* This and SurpriseIncest are both {{subverted|Trope}} on the Season 9 premiere of ''Series/HowIMetYourMother''. Robin and Barney, who are about to get married, realize they share a cousin. The audience is reminded that Barney found out a couple of seasons back that he's 1/4 Canadian. Luckily, they're not actually blood relatives.
* ''Series/{{JAG}}'': Harm spends a substantial portion of the show (Seasons 1-3) searching for his father, who went MIA during UsefulNotes/TheVietnamWar. [[spoiler: His father escaped custody, and was later shot and killed, but not before meeting a Gypsy woman and fathering another son, Sergei.]]
* The premise of ''Series/JejakSuaraAdzan'' is about Dimas trying to find his long-lost older brother Dika, who had been adopted by another family when Dimas is an infant. The series drops clues and eventually reveals that [[spoiler:Putra, who has been helping Dimas find Dika, is Dika himself all along, without anyone realizing it until the finale because Dika's adopted parents changed his name to Putra when he is three-years old.]]
* ''Franchise/KamenRider'':
** ''Series/KamenRiderKiva'' has Wataru Kurenai learn that [[spoiler:Taiga Nobori, his childhood best friend, is in fact his older half-brother by way of their mother Maya. Neither of them knew this until Maya told Taiga, who then told Wataru]].
** ''Series/KamenRiderDouble'' has [[spoiler:Phillip]] find out that [[spoiler:Wakana]] is his sister. After he's been acting rather close to her, but apparently it was sibling love all along, so it's okay.
* ''Series/KyleXY'':
** Jessi is not Kyle's sister, but she was born in the same laboratory and was cloned from [[spoiler: Kyle's biological father's lover]]. At least until the ending which made them not be clones without explaining it very well.
** A straighter use of the trope occurs in the [[CutShort not-really-a-finale]]: [[spoiler:Cassidy is Kyle's brother, although born naturally and thus lacking any of Kyle's powers]].
* ''Series/LAsFinest'': Syd learns she has an adult half-sister as a result of her dad cheating with another woman on her mom. Further, she has a niece and nephew, her half-sister's kids.
* Something similar happened in ''Series/LawAndOrderSpecialVictimsUnit'', where a teenager found out he'd been dating/sleeping with his (now-murdered) half-sister. He was originally a suspect, but Stabler considered him innocent when the revelation actually made him throw up; Dr. Huang points out that it is physiologically impossible to fake that kind of reaction. [[spoiler: His father killed the girl by accident, then the boy's mother murdered the father after she found out that he had been cheating on her all that time.]]
* ''Series/LegendOfTheSeeker'': Richard learns he has a half-sister he never knew about, Jennsen.
* ''Series/{{Lost}}'':
** When Jack and Kate get off the island they concoct a ruse to protect the island from the outside world and part of this lie includes hiding the fact that Aaron is fellow 815 survivor Claire's baby and so they pass Aaron off as Kate's son. At the funeral for Jack's father Christian he meets Claire's mother Carol who tells him that her daughter was also Christian's daughter and that she was on the flight with Jack and her name was Claire.
** Daniel turns out to be the son of Charles Widmore and Eloise Hawkings. And the half-brother of Desmond's lover Penelope.
*** Locke's biological parents re-enter his life to trick him out of his kidney. Locke's father later destroys Locke's relationship with the love of Locke's life and later still paralyzes Locke when he knocks him out a window.
* ''Series/TheLWord'':
** After reconnecting with her estranged dad, Shane finds out she has a brother, Shay, from his second wife. [[spoiler:Eventually she has to care for him as his mom leaves him with Shane.]]
** In ''Generation Q'' Angelica does a DNA search and finds she's got a half-sister as they share the same birth father (who had been her mother's sperm donor).
* ''Series/MakoMermaidsAnH2OAdventure'': In late season two Zac discovers [[spoiler:that not only is he adopted and a real merman, but he is also the long lost of Mimmi.]]
* ''Series/MelrosePlace'':
** Jane finds out she is adopted and eventually connects with her birth mother.
** Sydney turns out to be Violet's mother in the relaunch.
** Amanda meets her long lost mother and half-brother before they are spun off onto Models Inc.
* Has reached epidemic levels in ''Series/{{Merlin|2008}}''; there's been Morgana's long-lost sister Morgause, Merlin's long-lost father Balinor, Guinevere's long-lost brother Elyan, and Arthur's long-lost uncle Agravaine ([[RememberTheNewGuy who has apparently been there all along]]). And then there's Morgana and Morgause's mother Vivianne, whose absence from the show is never explained.
* ''Series/{{Monk}}'' discovers he has a long lost brother.
* ''Series/Mouse2021'': Michaela, the girl at the orphanage, is really Jae-hoon/Ba-reum's sister Jae-hee.
* Detective William Murdoch of ''Series/MurdochMysteries'' discovers that he has a half-brother in the Season 2 finale.
* ''Series/NipTuck'':
** Perpetual fuck-up Matt has sex with one of his father Christian's patients Emme. After they do the deed Emme reveals that she came to town to meet her father who is Christian. They seriously consider staying together as a couple after they find out.
** Christian eventually meets his biological mother and one of her other two children and finds out his mother put him up for adoption because she became pregnant as a teenager when she was raped by a stranger and her parents had been too religious to allow her to have an abortion.
* Played with in an episode of the short lived Creator/JohnGoodman vehicle ''Normal, Ohio.'' His character's [[DadTheVeteran father]] admitted to having an affair with a woman that "could melt butter on her ass" [[UsefulNotes/TheKoreanWar while serving in Korea,]] and while being engaged to his current wife. When she admitted to having an affair he gave her hell for it, while not mentioning his own indiscretion. At the ned when the situation was resolved, without admitting to the affair, Goodman's character calls his parents' house while they're out and leaves a message in their answering machine in [[AsianSpeekeeEngrish a heavily accented, high pitched voice]] claiming to be the woman he slept with, and that she will be bringing her adult twin sons to meet their father for the first time.
* ''Series/NoughtsAndCrosses'': Yaro turns out to be the half-brother who [[spoiler:Sephy and Minerva]] had not known they had.
* Nichols family patriarch Caleb Nichols has an illegitimate daughter named Lindsay on ''Series/TheOC'' in addition to his two other daughters Kirsten and Hailey.
* It would be easier to list the characters on ''Series/OnceUponATime'' who don't find out they are related in some way.
* ''Series/TheOutpost'':
** A man claiming he's Gwynn's brother arrives at the Outpost. [[spoiler: It turns out that he's a fake.]]
** [[spoiler:Naya]] turns out to be [[spoiler:Janzo]]'s sister.
* ''{{Series/Pandora}}'': [[spoiler:Tierney]] it turns out is Jax's mother's birth daughter. Since Jax is adopted, her mother says they're therefore "kind of sisters".
* In ''Series/ThePretender'' Jarod finds out that he has a long lost brother Kyle and sister Emily. Ms. Parker founds out Mr. Lyle is her twin brother. Then there's Ethan who is the son of Jarod's father and Ms. Parker's mother. Oh and Mr. Lyle and Ms. Parker have another biological half-sibling, Mr. Raines' late daughter Annie.
* ''Series/PrincessSilver'':
** Fu Chou is [[spoiler: Wu You's twin brother]]. He doesn't react well when he learns the truth.
** Hen Xiang is [[spoiler: Rong Le's sister]]. This doesn't cause nearly as much angst when it's revealed.
* ''Series/PushingDaisies'':
** Ned's DisappearedDad started a new family after abandoning Ned at boarding school, then pulled the DisappearedDad thing again. As a result, the Pie Maker has twin half-brothers. In a bit of a subversion, Ned's always been aware of the twins' existence; he just didn't want anything to do with them until recently.
** And [[spoiler: Ned's own father]] has turned up, making one more Ned-relative who has returned from being long lost.
* ''Series/ReservationDogs'': In "Elora's Dad" Elora finally meets Rick, her birth father, and discovers that she also has three half-siblings who are very happy to have an older sister.
* Tommy Gavin from ''Series/RescueMe'' learns that his father Michael fathered an illegitimate son who has grown up to be Father Liam Murphy, a Catholic priest. Tommy learns that his half-brother is molesting the teenage boys he is mentoring and puts a stop to it.
* ''Series/{{Riverdale}}'':
** The first season's penultimate episode reveals that Polly Cooper's great-grandfather was a brother to Jason Blossom's great-grandfather; he was born Blossom, but changed it to Cooper. This means that not only are [[SurpriseIncest Polly and Jason third cousins]], so are Betty and Cheryl.
** Betty later finds out that she has a brother she didn't know about. Alice and Hal conceived a baby boy when they were still in high school, whom they gave up for adoption. The brother, Charles "Chic", appears in season 2, but it turns out that he is an impostor, as the real Charles had died. Only for the season 3 finale to reveal that Charles is still alive -- and in a relationship with Chic.
* In ''Series/RobinHood'', [[spoiler:Robin's father and Guy of Gisborne's mother were having an affair, making them... something.]] And there's also two previously unknown characters introduced as long lost siblings: [[spoiler: Isabella, Gisborne's long lost sister, and Archer, Gisborne ''and'' Robin's unknown half-brother]].
* Parodied in ''Series/SabrinaTheTeenageWitch'' in an episode where Sabrina's magic turns her life into a soap opera. A police detective and model bump into each other at a FashionShow.
-->'''Detective:''' Have you ever been to the Grand Canyon?\\
'''Model:''' Only as a child.\\
'''Detective:''' Beverly?\\
'''Model:''' Kenneth!\\
'''Detective:''' My long lost sister!
* On ''Series/SixFeetUnder'' George Sibley's illegitimate son Kyle was a bit bitter and sent his father boxes of feces.
* ''Series/{{Smallville}}'': A variation. Once [[BigBad Lex]] was off the show, new character [[TheBaroness Tess Mercer]] took his place as CEO of [=LuthorCorp=]. She seems [[SuspiciouslySimilarSubstitute very similar]] to Lex, especially in Season 8, and she has much of his same [[ManipulativeBastard habits]]. Two and a half seasons after her introduction, it's revealed that the reason she seems so much like a Luthor is [[TheReveal because she is one]], as she finds out that she's Lionel's daughter. It's not a straight example because they weren't on the show at the same time, but it has a significant impact on the show and on Tess's character. (In the GrandFinale, Lex's clone reveals that [[{{Jerkass}} he knew the entire time]].)
* In the third season of ''Series/SonsOfAnarchy'' Samcro goes to Ireland to recover Jax's kidnapped son Abel and meet up with the Irish chapter of Samcro. While there Jax makes out with Trinity the step-daughter of one of Samcro's founders. It turns out Trinity's mother had an affair with Jax's father when he was in Ireland founding the Irish chapter and Trinity is the result.
* ''Series/StarTrekDeepSpaceNine'':
** Benjamin Sisko finds out his real mother was inhabited by one of the prophets of the Bajoran wormhole. Benjamin's birth was arranged by the prophets and the entire time Benjamin's father was with Benjamin's mother she was possessed by the prophet. Benjamin's real mother promptly leaves Benjamin's father after the prophet quits possessing her. Benjamin's father later marries another woman with whom he has more children and Ben is raised to believe his step-mother is his real mother.
** Gul Dukat discovers his bastard daughter Tora Ziyal with a Bajoran woman is alive on a Breen prison world. Originally he plans to kill her but later accepts her into his family. Dukat later fathers a child with another Bajoran woman in his pah wraith cult and tries to claim the child is really that of her husband's but was somehow transformed by the pah wraiths as part of their covenant. Kira doesn't buy it.
* ''Series/StarTrekTheNextGeneration'':
** The series pulls this one, with the twist of it being ''the android'' whose mother has shown up. A couple of his brothers have shown up too. One is evil, the other just dumb.
** Worf's long lost brother Kurn also shows up as well as his long lost son Alexander. Picard visits his estranged brother Robert and meets his nephew Rene for the first time. Riker's estranged father visits. Troi finds out she had an older sister who drowned that she never knew existed. Tasha Yar's sister also visits the Enterprise after her death.
* ''Series/{{Supernatural}}'':
** In the fourth season episode "Jump the Shark", Sam and Dean meet a young man named Adam, who says John Winchester was his father, making him their half-brother. After spending much of the episode trying to determine if this is true (while also trying to help Adam find out what happened to his missing/possibly dead mother), they discover that he's lying... [[spoiler: he's really a ghoul who killed and is now mimicking the ''real'' Adam... who ''was'' their brother.]]
** Season 6 introduces Samuel Campbell, the brothers' maternal grandfather, as well as cousins Gwen, Christian, Mark and Johnny Campbell [[spoiler: (the last one dies before his introduction)]].
** In Season 8, the brothers encounter Henry Winchester, their paternal grandfather who was believed to have abandoned the family. [[spoiler: (He used Men of Letters magic to time jump to the future but was killed before he could return to his own time.)]]
* ''Series/TeenWolf'':
** In the third season we get to meet [[spoiler: Derek's younger sister Cora, who was thought to be killed in the Hale fire]].
** And in Season 3B we meet another long-lost Hale, [[spoiler: Peter's daughter Malia Tate, who even he didn't know he had]].
* In ''Series/TrueBlood'', Vampire Bill discovers [[spoiler: after he's already started sleeping with one of them]] that the Bellefleur siblings are his great-great-great grandchildren.
* ''Series/TheVampireDiaries'':
** [[IdenticalGrandson Katherine is Elena's great-great...grandmother.]]
** Alaric, due to his marriage to Isobel is Elena's stepfather.
* ''Series/{{Willow}}'': Scorpia, leader of the [[BanditClan Bone Reavers]], is revealed as Jade's long-lost older sister. Jade previously had believed her entire birth family was dead.
* On ''Series/WKRPInCincinnati'', Les got a "Dad is not your father" moment, finding out his biological father was still alive and was a barber in Kentucky (the man Les thought was his father was actually his step-father, and had passed away). Les goes to his barber shop and they have a conversation, but Les doesn't reveal who he is.
* ''Series/TheXFiles'':
** We find out that Jeffrey Spender, who was working for CSM and managed to steal the X-Files from Mulder and Scully with Diana Fowley, is not only CSM's son but that CSM is also Mulder's biological father... making them half-brothers. Ouch. Presumably this revelation also makes Mulder's long-lost sister Samantha his half-sister.
*** In Season 11, Scully's son William [[spoiler: who was believed to have been abandoned sometime before ''Film/TheXFilesIWantToBelieve'' takes place, is both alive and later discovered to]][[spoiler: not be Mulder's son. He is also CSM's son, making William the half-brother to Mulder and Jeffrey.]]
*** [[spoiler: At the end of the series, it was revealed that Scully was pregnant again this time with Mulder's child. If she carries to term and gives birth, the child would be William's maternal half-sibling but paternal half-nephew or niece as well as CSM's grandchild.]]
** Scully had a daughter she never knew about thanks to some ova-stealing. [[spoiler:Unfortunately, she only knows her briefly since before her death.]]

[[folder:Myths & Religion]]
* Myth/ClassicalMythology: Theatre/{{Oedipus|TheKing}}, long-lost son of Laios (whom he kills) and Iocaste (whom he marries). A pattern repeated with Telegonos, son of [[Literature/TheOdyssey Odysseus]] and Circe. He winds up accidentally killing his long-lost father, and in a creative instance of PairTheSpares, he marries Odysseus' widow Penelope, while Penelope's son Telemachus marries Circe.
* Myth/ArthurianLegend: Morgan le Fay to Myth/KingArthur, who comes with extra disturbing quotient in the form of their mutual child he just sort of forgot about.
* Literature/{{Mahabharata}}: Much to their dismay, Arjun and his brothers come to find that [[TheDragon their scheming cousin's right hand man Karna]] is actually ''their older brother'', whom their mother abandoned after giving birth to him out of wedlock, leaving him to be brought up by low-ranking commoners & receive much mockery for his supposedly "low birth" despite [[TheAce his prowess as a warrior]]). They only find out after they've killed him in [[SuccessionCrisis a bloody, costly war of succession]].
* Literature/TheBible: Due to his ParentalFavoritism, Joseph was sold to slavers by his brothers. He ends up in Egypt, where he eventually becomes the Pharaoh's vizier. Years later, he sees his brothers, and without revealing his identity, invites them to dinner before framing them for theft. He agrees to let them go on the condition that they leave the youngest of the brothers as his slave. The brothers beg for him not to do so, as it would break their father's heart. ''Then'' Joseph reveals who he is.

[[folder:Pro Wrestling]]
* Wrestling/{{Kane}}, the long thought lost brother to Wrestling/TheUndertaker in Wrestling/{{WWE}}.
[[/folder]]

[[folder:Radio]]
* In ''Radio/AdventuresInOdyssey'', Eugene Meltsner's TellMeAboutMyFather quest results in the discovery that he and local [[CrustyCaretaker window-washer]] Bernard Walton are cousins. This fact is the catalyst for multiple episodes, often involving [[SourSupporter Bernard]] [[SarcasticDevotee grudgingly]] [[ThoseTwoGuys agreeing]] [[TrueCompanions to help Eugene.]]
-->'''Bernard:''' After all, you are... ''(hesitates) family.''
* ''WesternAnimation/TheAdventureZone'': In "Reunion Tour - Part 2", Taako learns that [[spoiler:he had a twin sister named Lup, who went missing nearly a decade ago, and who he completely forgot when Lucretia fed the information about her existence to the Voidfish. It then turns out Lup has been trapped in Taako's Umbrastaff that entire time, and the two are reunited when Taako realizes she's in there and snaps it in half over his knee.]]
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* ''VideoGame/Yakuza1'' has Mizuki Sawamura, Haruka's mother and Yumi's long-lost sister. Apparently, the two sisters have had no contact with each other since Haruka's birth nine years prior to the present day, and Kiryu, Nishiki, and Reina all had no idea Yumi even ''had'' a sister. This turns out to be because [[spoiler:she doesn't actually exist. "Mizuki" is a SecretIdentity for Yumi, created by Shintaro Kazama, to protect her from both the Tojo Clan and Kyohei Jingu.]]

Liebe, the devil in Asta's grimoire, is actually this to Asta, being his adoptive brother. Asta's mother Licita abandoned him due to her body stealing magic and life from living things near her, and adopted Liebe as her child.

Ichika, is the younger sister of Yami Sukehiro, who has not seen her brother since he was 13 after getting shipwrecked in the Clover Kingdom

* ''[[WesternAnimation/TeenageMutantNinjaTurtles2012 TNMT (2012)]]'': It turns out that Miwa, Splinter's long lost daughter whom he believed was murdered by The Shredder when the latter murdered Splinter's wife, is not only still alive, but [[spoiler: is actually Karai]].

* Hank Venture from ''WesternAnimation/TheVentureBrothers'' finds out that his best friend Dermott Fictel is the illegitimate son of his father Rusty Venture and Nikki Fictel. Nikki Fictel was a teenager when Dermott was born and Dermott was raised to believe Nikki was his sister and his grandmother was his mother. Hank finds this out shortly AFTER losing his virginity to Nikki but has his memory wiped.

* ''[[VideoGame/SoulSeries Soulcalibur]]'': In ''Soulcalibur V'', [[spoiler:Xiba and Leixia are half-siblings. Xiba is the result of an affair between Xianghua and Kilik, while Leixia is the daughter of a Ming General; Xianghua married the latter per her family's request after finding out of her affair with Kilik. As of right now, neither of them know their relationship]].

* Something similar happened in ''Series/LawAndOrderSpecialVictimsUnit'', where a teenager found out he'd been dating/sleeping with his (now-murdered) half sister. He was originally a suspect, but Stabler considered him innocent when the revelation actually made him throw up. [[spoiler: His father killed the girl by accident, then the boy's mother murdered the father after she found out that he had been cheating on her all that time.]]

* In ''VideoGame/{{Onmyoji}}'' [[spoiler: Kagura is Hiromasa's long-lost sister]].

* Almost everybody with a sibling in ''VideoGame/FireEmblemTheBlazingBlade'' seems to have been separated, but [[spoiler: Rebecca and Dan/Dart]] are the ones who fit this trope best. Nino is suggested to be the long-lost niece of [[spoiler:Canas's wife]].

* Played to a ridiculous level in the {{Wuxia}} ''[[http://en.wikipedia.org/wiki/Demi-Gods_and_Semi-Devils Demi Gods and Semi Devils]]'' with the protagonist's father, Duan Zhengchun, being a big case of TheCasanova. ''Every single'' {{Love Interest|s}} his son, Duan Yu, meets in his journey turns out to be his half-sisters. [[spoiler: Though this is subverted later on as Duan Yu isn't Zhengchun's son, thus resulting in Duan Yu [[MarryThemAll marrying all of them]].]]