History Main / HereditaryHomosexuality

* In the ''Literature/HeraldsOfValdemar'' series, Vanyel of the ''Literature/LastHeraldMageTrilogy'' was a FamedInStory gay man. He still had four children via being a ChosenConceptionPartner. One of the gay men of the "main" time period, Firesong, is descended from Vanyel's first child, though another member of that SecretLegacy is straight.

* Tomoyo of ''Manga/CardCaptorSakura'' has an unrequited crush on her best friend and [[KissingCousins second cousin]] Sakura. It's later revealed that [[GenerationXerox her mother had the exact same relationship with Sakura's mother]].

[[folder:Jokes]]
* One old joke has a client going to a doctor about his attraction to men, and how his father, his brothers, his uncles, and his cousins also have that. When the doctor asks if there is anyone in his family who is not attracted to men, the client replied that his sister isn't.
[[/folder]]

[[folder:Live-Action Film]]
* In ''Film/AnotherGayMovie'' Andy is gay and his father is either gay or bisexual (and his mom is a drag queen although the character is apparently female). Played for squick when the two nearly hook up in a public men's room. The sequel gets squickier when the two had anonymous sex, finding out the truth only after.

* ''Film/{{Crush|2022}}'': Gabby is a lesbian, while her twin AJ's bisexual.

* ''Film/UncleFrank'': {{Discussed}} when Frank's mother tells him his great uncle was also gay and speculates that if curly hair can be inherited, then why not this too.

* Michael on ''Series/QueerAsFolk'' learns that his father is a drag queen.

* ''Series/ComeFlyWithMe''. Fearghal is one of eleven brothers who are all air stewards; they're also all gay (except the one who's bi).

* In the ''Literature/HeraldsOfValdemar'' series, Vanyel the last Herald-Mage, a notorious historical figure, was gay. He, however, had four children via being a ChosenConceptionPartner. One of the gay men of the main time period is descended from Vanyel's first child.

** Willow is the only named member of the cast who is [[HasTwoMommies the child of a same sex couple]] (her fathers' exact orientations beyond an attraction to men being unstated), and she was confirmed in a post series livestream to be pansexual.

* Played with in ''Series/ThirteenReasonsWhy''. It's revealed that Courtney Crimsen, who [[HasTwoMommies has two gay fathers]], is a lesbian, though she was adopted by her dads so there's no biological factor in this case. It's PlayedForDrama; due to growing up with people being homophobic about her fathers, Courtney herself is extremely reluctant to come out of the closet and feels driven to do some morally questionable things to hide her sexual orientation. She also feels uncomfortable that people would assume she's gay ''just'' because her dads are. [[spoiler: She does eventually come out and [[GoodParents her dads are very supportive]]; she also starts dating a girl and takes her as her date to the Spring Fling]].

* [[https://twitter.com/venusandelio/status/1093948364364881920?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1093948364364881920&ref_url=https%3A%2F%2Fwww.cristianosgays.com%2Fpage%2F5%2F This case in which a teenager]] decided to come out as bisexual to her mother ... and she responds by confessing that she is also bisexual.

* [[https://twitter.com/venusandelio/status/1093948364364881920?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1093948364364881920&ref_url=https%3A%2F%2Fwww.cristianosgays.com%2Fpage%2F5%2F This case in which a teenager]] decided to leave the closet as a bisexual in front of her mother ... and she responds by confessing that she is also bisexual.

* Implied in ''WesternAnimation/TheOwlHouse''. Luz is canonically bisexual; and while her mother's own sexuality is never specified outside of her attraction to men, the fact that she had a bisexual pride magnet on her fridge ''before'' Luz came out to her suggests that she is bisexual as well.

* Sibling protagonists Kassandra and Alexios from ''VideoGame/AssassinsCreedOdyssey'' are both bisexual, as are all of their potential love interests. ({{Justified}} by the EveryoneIsBi setting of Ancient Greece.)
* Damien from ''VisualNovel/MonsterProm'' has two HappilyMarried dads and is attracted to men, women, everyone in-between, and anyone who exists outside the human gender spectrum altogether. {{Downplayed}} and {{Justified}} thanks to the [[EveryoneIsBi Everyone Is Pansexual]] setting of the game.

In fiction, of course, it's up to the writer. Fairly often, you may see gay characters who have relatives who are also gay. In particular, if a gay character has kids with TheBeard or via HomosexualReproduction those kids are more likely to be gay than not.

** Hope is a lesbian just like her grandmothers Ruby and Sapphire. However, she was adopted by their daughter Garnet, so there's no biological factor in this case. That being said, however, Hope's gestational parent Malachite is a transmasculine non-binary person who's dating a woman by the time Hope and her twin brother Jonah are attending college in ''Be Wherever You Are''.

* ''Series/FirstKill'': Juliette, one of the lead characters, is a lesbian. Her older sister Eleanor is indicated to be a bisexual woman.

* Homosexuality in males is correlated with having older brothers and the more older brothers you have, the more likely you are to be gay. [[https://en.m.wikipedia.org/wiki/Fraternal_birth_order_and_male_sexual_orientation The most popular hypothesis for this phenomenon]] is that with each successive boy pregnancy, the mother’s body begins to have an autoimmune reaction that produces antibodies against y-chromosome linked proteins.

* Discussed in Creator/DanSavage's book ''The Commitment'', chronicling his decision to go to Canada to marry his long-term partner Terry Miller (it wasn't legal in the US yet). Their adopted son DJ was still in the "girls are icky" phase, and during the trip, he tells Dan he wanted to be gay like his fathers. Dan gently told his son it doesn't work that way, but in the book, he joked that Christian fundamentalists' hearts across the country must be breaking now. For what it's worth, the now-adult DJ has since come out...as straight.

* Often discussed on ''Series/RuPaulsDragRace''. Dahlia Sin from Season 12 has a twin brother who's gay and, to her chagrin, had recently started doing drag. Also, Season 14's Alyssa Hunter and Canada Season 2's Synthia Kiss both revealed that their fathers are gay. Perhaps reaches its peak in Season 15, when biological siblings and drag queens (yes, they're both gay) Sugar and Spice compete against one another.

* Often discussed on ''Series/RuPaulsDragRace''. Dahlia Sin from Season 12 has a twin brother who's gay and, to her chagrin, had recently started doing drag. Also, Season 14's Alyssa Hunter and Canada Season 2's Synthia Kiss both revealed that their fathers are gay.

** ''Generation Q'' introduces lesbian Sophie, whose brother Maribel's gay.

** Bette and Tina's daughter Angelica turns out to be queer, coming out to then dating her girlfriend Jordi.