History Main / LongLostRelative

* ''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.

* Having Mulder's sister turn up is common in ''Series/TheXFiles'' fanfics. One troper read one [[spoiler:in which it turns out Monica Reyes started life as Samantha Mulder]], and is sure that one wasn't unique.

* At the end of the opera ''Theatre/IlTrovatore'' an old gypsy reveals to the villain that he has just killed his long-lost brother. Since this is the last line of the libretto (and there are just 2 bars of music left to go), the baritone is reduced to making a face at the audience to express his dismay as the curtain comes down. And this troper has seen some truly ridiculous grimacing. Verdi must have been under deadline pressure.

* ''Manga/BlackClover'': 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.

* ''Series/{{Barry}}'': In Season 4 it's revealed Fuches is the father of a grown daughter with a former girlfriend who he never knew about until then. He has them live with him in his new mansion, but this is hardly a happy reunion because by now he's become a ruthless criminal kingpin. They spend most of their time staring mutely, likely too scared to say or do anything else.

* ''LightNovel/{{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.

* In ''LightNovel/TheStoryOfSaiunkoku'', it is revealed that Shi Seiran, the retainer (but practically an adoptive brother) of the protagonist Shuurei's family, is [[spoiler: the exiled prince Seien, the much admired and missed second eldest brother of Emperor Ryuuki]].

* In the eleventh ''LightNovel/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]].

* ''Amazing Spider-Man: Family Business'' introduces Peter Parker's sister, Teresa Parker.

** In one story, 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.

* ''Manga/{{Bleach}}'': Ichigo is eventually revealed to be the cousin of Kaien, Kuukaku and Ganju through his father (their uncle), explaining why Ichigo and Kaien look so alike. Ichigo is also eventually revealed to be related to Uryuu, as his mother was the cousin of Uryuu's father.

** ''Anime/FullmetalAlchemist2003'': During the climactic final battle, it's revealed that [[spoiler: Envy is the resurrection-attempt of the son of Dante and Hohenheim, making him sort of Ed and Al's half-brother. Exactly why he looks like Hohenheim's current body, given that Hohenheim is a {{Body Surf}}er, despite being centuries old is anyone's guess]].

* ''VideoGame/DoubleDragonIIITheRosettaStone'' introduces the previously unseen Lee brother Sonny as the third playable character, with no explanation ever given for his absence in prior games. He would not be seen again for 27 years before returning as a hidden character in ''VideoGame/DoubleDragonIV'', and his appearance in ''VideoGame/RiverCityGirls2'' lampshades his obscurity compared to his far more famous siblings.

* ''VideoGame/DoubleDragonIIITheRosettaStone'' introduces the previously unseen Lee brother Sonny as the third playable character, with no explanation ever given for his absence in prior games. He would not be seen again for over two decades until returning as a hidden character in ''VideoGame/DoubleDragonIV'', and his appearance in ''VideoGame/RiverCityGirls2'' lampshades his obscurity compared to his far more famous siblings.

* ''VideoGame/DoubleDragonIIITheRosettaStone'' introduces the previously unseen Lee brother Sonny as the third playable character, with no explanation ever given for his absence in prior games. He would not be seen again for many years until ''VideoGame/DoubleDragonIV'', and his appearance in ''VideoGame/RiverCityGirls2'' lampshades his obscurity compared to his far more famous siblings.

* ''VideoGame/DoubleDragonIIITheRosettaStone'' introduces the previously unseen Lee brother Sonny as the third playable character, with no explanation ever given for his absence in the previous games. He would not be seen again for many years until ''VideoGame/DoubleDragonIV'', and his appearance in ''VideoGame/RiverCityGirls2'' lampshades his obscurity compared to his far more famous siblings.

* ''VideoGame/DoubleDragonIIITheRosettaStone'' introduces the previously unseen third Lee brother, Sonny, as the third playable character, with no explanation ever given for his absence in the previous games. He would not be seen again for many years until ''VideoGame/DoubleDragonIV'', and his appearance in ''VideoGame/RiverCityGirls2'' lampshades his obscurity compared to his far more famous siblings.

* ''VideoGame/DoubleDragonIII'' introduces the previously unseen third Lee brother, Sonny, as the third playable character, with no explanation ever given for his absence in the previous games. He would not be seen again for many years until ''VideoGame/DoubleDragonIV'', and his appearance in ''VideoGame/RiverCityGirls2'' lampshades his obscurity compared to his far more famous siblings.

** 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]].

* ''Anime/BirdieWing'': Eve and Aoi are revealed to be half sisters, with their father being the legendary golfer Kazuhiko Hodaka.

* In ''VideoGame/ShadowHearts: Covenant'', this happens more than once.

** [[spoiler:Apollo and Trucy]] in ''VisualNovel/ApolloJusticeAceAttorney''. Though as of right now, there is still no sign that the two of them know about it.
** Another example happens in ''[[VisualNovel/PhoenixWrightAceAttorney Trials and Tribulations.]]'' In the last case not only do we find out that [[spoiler: victim Elise Deauxnim was Mia and Maya Fey's long-lost mother (and Pearl's aunt), but serial killer Dahlia Hawthorne is Morgan Fey's long-lost daughter and Pearl's half-sister... as is Dahlia's twin sister Iris]].

* In a post-Poof episode of ''WesternAnimation/TheFairlyOddParents'', it turns out that [[TheDitz Cosmo]] and [[TheAhnold Jorgen von Strangle]] are cousins, and that fact was kept a secret for obvious reasons. Bonus points if you throw in TalkingToHimself, since both characters are voiced by Creator/DaranNorris.