History BrotherSisterIncest / WesternAnimation

-->'''Steve:''' What a boob.
-->'''Stan:''' What was that, Steve?
-->'''Steve:''' Um, I, uh... asked Hayley if I could squeeze her boob.
-->'''Stan:''' I love it when you kids get along.

* Aversion: With the communal raising of children the titular species employs in ''WesternAnimation/{{Gargoyles}}'', this was an early fan idea about Demona's and Goliath's relationship, until WordOfGod severely beat that out of the fandom by stating that the pheromones a gargoyle releases when he is courting smell horrible to any close family relation. This is only natural, really, since nature prefers genetic diversity over in-breeding. Interestingly, gargoyles still consider the other gargoyles they were raised with to be their siblings, but coupling inside this social family appears to be perfectly normal simply because if they had already evolved a ''physical'' mechanism to prevent inbreeding (the pheromones), then there'd be no pressing advantage to evolving a ''psychological'' mechanism (Westermarck Effect -- the origin of the incest taboo).

* In ''WesternAnimation/TheTransformers'', Orion Pax and Ariel were originally boyfriend and girlfriend. After they were killed by Megatron, Alpha Trion recreated them both as Optimus Prime and Elita One and the two continued the relationship in their new lives. Their anatomy turned out to be similar enough that Optimus is able to save Elita's life with an energy transfer. There is no outright mention of "incest", but the implications are still there with Elita commenting that Alpha Trion is like a father to her and Optimus replying with "more than you'll ever know".

* In ''WesternAnimation/TheTransformers'', Orion Pax and Ariel were originally boyfriend and girlfriend. After their bodies were destroyed, Alpha Trion recreated them both as Optimus Prime and Elita One and the two continued the relationship in their new lives. Their anatomy turned out to be similar enough that Optimus is able to save Elita's life with an energy transfer. There is no outright mention of "incest", but the implications are still there with Elita commenting that Alpha Trion is like a father to her and Optimus replying with "more than you'll ever know".

* In ''WesternAnimation/TheTransformers'', Orion Pax and Ariel were originally boyfriend and girlfriend. After their bodies were destroyed, Alpha Trion recreated them both as Optimus Prime and Elita One and the two continued the relationship in their new lives. Their anatomy turned out to be so similar enough that Optimus is able to save Elita's life with an energy transfer. There is no outright mention of "incest", but the implications are still there with Elita commenting that Alpha Trion is like a father to her and Optimus replying with "more than you'll ever know".

* In ''WesternAnimation/TheTransformers'', Orion Pax and Ariel were originally boyfriend and girlfriend. After their bodies were destroyed, Alpha Trion recreated them both as Optimus Prime and Elita One and the two continued the relationship in their new lives. Their anatomy turned out to be so similar that Optimus is able to save Elita's life with an energy transfer, and Optimus seemed a bit taken aback when Alpha Trion told them about their origins. When she steps close to him at the end, he even walks away quickly. No one outright mentions the word "incest", but it's heavily implied that something weird's going on. "Something weird is going on" is that Optimus had forgotten who his creator was so it's more surprise that he's learned Alpha is his deadbeat dad. Also Elita was leaning in for a kiss so it may be more "hero denying his pleasures" than anything else. Also two reasons he denied her: [[MoralGuardian parents' anger]] at robots kissing and kids' reaction to seeing a parental (albeit fictional) figure smooching other than a quick peck on the cheek.

* PlayedForLaughs on one episode of ''WesternAnimation/TeenageMutantNinjaTurtles''. Krang watches soap operas, and one episode he catches features an engaged couple named John and Marcia.

* Aversion: With the communal raising of children the titular species employs in ''WesternAnimation/{{Gargoyles}}'', this was an early fan idea about Demona's and Goliath's relationship, until WordOfGod severely beat that out of the fandom by stating that the pheromones a gargoyle releases when he is courting smell horrible to any close family relation. This is only natural, really, since nature prefers genetic diversity over in-breeding. Interestingly, gargoyles still consider the other gargoyles they were raised with to be their siblings, but coupling inside this social family appears to be perfectly normal simply because if they had already evolved a ''physical'' mechanism to prevent inbreeding (the pheremones), then there'd be no pressing advantage to evolving a ''psychological'' mechanism (Westermarck Effect -- the origin of the incest taboo).

* WesternAnimation/MyLifeAsATeenageRobot: Lil Acorn, a robot that Nora created when she was younger, wanted to marry Jenny, who is Nora’s daughter. Seeing how Jenny considers [=XJs=] 1-8 to be her sisters, it’s safe to say that he's pretty much her brother in a way...

* Parodied in ''WesternAnimation/TwoStupidDogs'' in an episode where the dogs go to live with a family much like the Bradys from ''Series/TheBradyBunch'' (which is about a mixed family so the siblings are not biologically related). The teenage brother and sister get into a fight, before the mom tells them to kiss and make up. They proceed to do so ''literally'' by [[GettingCrapPastTheRadar making out]].

--->'''Leia, as she lies in bed with Luke:''' That was so wrong.

** "Fresh Heir" reveals that they bathe together. Due to Chris' Autism this could be for perfectly innocent reasons... but since they keep it secret from their parents it probably isn't.

** In the episode "Halloween on Spooner Street", Meg and Chris in costume make out in a dark closet not knowing who the other is until the door is opened. They're both horrified with Meg screaming that they "did so much". However, later they are more pleased with themselves and Meg suggests that Chris call her back. Weirdest of all, his refusal isn't actually disgust and by Seahorse Seashell Party it looks like he's changed his mind.

--->'''Leia, as she lies in bed with Luke:''' That was so wrong.\\

* WesternAnimation/MyLifeAsATeenageRobot: Lil Acorn, a robot that Nora created when she was younger, wanted to marry Jenny, who is Nora’s daughter. Seeing how Jenny considers XJs 1-8 to be her sisters, it’s safe to say that he's pretty much her brother in a way...

-->'''Bart:''' A little is not gonna be enough, honey pie.

-->'''Homer:''' Yep, this place is great, and someday when Lisa and Bart get married it will all be theirs.

-->'''Homer:''' OK... but I'm not paying for two weddings.

* Played for laughs in ''WesternAnimation/HarveyBirdmanAttorneyAtLaw'' Phil runs away from his wedding to Birdgirl to run off with his sister Phyllis, so revealed because Phil's daughter Judy refered to her as 'Aunt Phyllis'. Given how Phil doesn't know [[ParentalIncest Judy IS Birdgirl]], it was probably for the best. And in case you're wondering what could attract Phil to his sister, she basically looks like Phil with breasts, down to the EyepatchOfPower.

* WesternAnimation/MyLifeAsATeenageRobot: Lil Acorn, a robot that Nora created when she was younger, wanted to marry Jenny, who is Nora’s daughter. Seeing how Jenny considers XJ 1-8 to be her sisters, it’s safe to say that he pretty much her brother in a way...

** Cletus and Brandine are related to each other in all sorts of ways. One of them being as brother and sister. Brandine is also revealed to be Cletus' ''mother'' in one episode. [[RuleOfFunny Yeah, it's like that.]]

-->'''Lisa:''' I gonna do a little research.
-->'''Bart:''' A little is not gonna be enough honey pie.

-->'''Bart:''' You got it tootsie pop.

** Another has Bill visiting relatives in Louisiana. The family manse is home to Bill's aunt, her son Gilbert and three women approximately Bill's age, all of whom have the last name Dauterive. Two of them are the widows of Gilbert's brothers, the other is Gilbert's sister. All three of the younger Dauterive women come on to Bill, who is himself uncertain which of the three is his first cousin. (That only briefly deters him from attempting to have sex with each of them, on the grounds that with each one of them the odds are 2:1 in his favor they ''aren't'' cousins.)

** In an episode, Meg asks Chris if he wants to "practice kissing again." Chris only turned her down because he was busy watching a security tape for the evil monkey.

** In the episode "Halloween on Spooner Street", Meg and Chris in costume make out in a dark closet not knowing who the other is until the door is opened. They're both horrified with Meg screaming that they "did so much". However, they try to make light of it later.
** Even weirder: Meg's dialogue suggests that upon reflection she might not be averse to the thought of doing it again, even going all the way with Chris. He warns her, "Don't count on it." On the other hand, he doesn't voice actual ''disgust''.

*** Seahorse Seashell Party implies that Chris might have had a change of heart.
*** Road To Rhode Island contains this exchange:

** In the episode "Halloween on Spooner Street", Meg and Chris in costume make out in a dark closet not knowing who the other is until the door is opened. They're both horrified with Meg screaming that they "did so much". However, they try to make light of it later. Chris knew what costume Meg was wearing, but being Chris, he had probably forgotten.
** Even weirder: Meg's dialogue suggests that upon reflection she might not be averse to the thought of doing it again, even going all the way with Chris. He, however, tells her, "Don't count on it." On the other hand, he doesn't voice actual ''disgust''.
** "Fresh Heir" reveals that they bathe together, a fact they keep secret from their parents.

** In an episode, Meg asks Chris if he wants to "practice kissing again." Chris didn't even bat an eye.

** Even weirder: Meg's dialogue suggests that upon reflection she might not be averse to the thought of doing it again, even going all the way with Chris. He, however, tells her, "Don't count on it."
** "Fresh Heir" reveals that they bathe together, a fact they keep secret from their parents

* In ''WesternAnimation/TheTransformers'', Orion Pax and Ariel were originally boyfriend and girlfriend. After their bodies were destroyed, Alpha Trion recreated them both as Optimus Prime and Elita One and the two continued the relationship in their new lives. Their anatomy turned out to be so similar that Optimus is able to save Elita's life with an energy transfer, and Optimus seemed a bit taken aback when Alpha Trion told them about their origins. When she steps close to him at the end, he even walks away quickly. No one outright mentions the word "incest", but it's heavily implied that something weird's going on. "Something weird is going on" is that Optimus had forgotten who his creator was so it's more surprise that he's learned Alpha is his deadbeat dad. Also Elita was leaning in for a kiss so it may be more "hero denying his pleasures" than anything else. Also two reasons he denied her: [[MoralGuardian parents' anger]] at robots kissing and kids' reaction to seeing a parental (albeit fictional) figure smooching other than a quick peck on the cheek.
* ''WesternAnimation/SouthPark'':
** There is an episode in which Stan has problems with his older sister, Shelly, who constantly beats him. When he asks his friends' help, Kenny suggests something through his orange parka. Although his words are muffled, the suggestion is obvious, because Stan replies, scandalized: "Sick dude, she's my sister!"
** Kyle suggests that Stan use ThePowerOfLove to stop her, just saying "Shelley, you're my sister and I love you..." the next time she tries to beat him; Kenny then finishes Kyle's sentence with "...and I want to take off your bra.". It doesn't work.
** One episode had a brother and sister news crew, Tom and Tammy Thompson, as lovers.
* ''WesternAnimation/AmericanDad'':
** In the episode "Stannie Get Your Gun," Roger tricks Steve into believing he's adopted. This triggers a bit of a HeroicBSOD in Steve and one of the first things he does is go to his sister Hayley, says there's always been "sexual tension" between them, then makes out with her. Hayley is understandably surprised and repulsed. Roger didn't intend it to happen, but he's not complaining either. ("Anything that happens after this point is ''gravy''.")
** In the episode "Meter Made," Roger paints a nude picture of Hayley (who was posing for an art class) and starts loaning it to Steve for use as ''masturbation material''. In Steve's defense, he didn't know it was Hayley (the painting stops just above her lips) and he's completely {{Squick}}ed out when Roger lets it slip. Likewise, Hayley never actually blames Steve and is just as angry over Roger screwing with the poor boy's head as she is over him selling her nude image in the first place.
** In the episode "An Apocalypse to Remember," the Smiths are invited to a party celebrating ethnic minorities in America. Unfortunately, due to Stan misreading the invitation, the family turn up wearing blackface make-up and the Smiths are forced to leave, embarrassed and angry. At the car this dialogue takes place:
-->'''Steve:''' What a boob.
-->'''Stan:''' What was that, Steve?
-->'''Steve:''' Um, I, uh... asked Hayley if I could squeeze her boob.
-->'''Stan:''' I love it when you kids get along.

* Aversion: With the communal raising of children the titular species employs in ''WesternAnimation/{{Gargoyles}}'', this was an early fan idea about Demona's and Goliath's relationship, until WordOfGod severely beat that out of the fandom by stating that the pheromones a gargoyle releases when he is courting smell horrible to any close family relation. This is only natural, really, since nature prefers genetic diversity over in-breeding. Interestingly, gargoyles still consider the other gargoyles they were raised with to be their siblings, but coupling inside this social family appears to be perfectly normal simply because if they had already evolved a ''physical'' mechanism to prevent inbreeding (the pheremones), then there'd be no pressing advantage to evolving a ''psychological'' mechanism (Westermarck Effect -- the origin of the incest taboo).
* The titular characters from ''WesternAnimation/TheTwinsOfDestiny'' had this implied, through their interaction throughout the series but mostly their decision in the final episode to leave everyone else and everything they have bonds with behind to be together. Just for the record: Jules and Julie both have a different set of parents, but their mothers are implied to have been incarnations of the Moon Goddess. Their mothers died during the twins' birth and their fathers were taken prisoner by the Empress of China, who wanted the twins dead. Jules and Julie were smuggled out of the country and brought to France, where they were raised by one man as siblings until they were about 14 years old. They know they aren't biologically related, but they do consider themselves siblings, often referring to the other with "my brother" or "my sister".
* An episode of ''WesternAnimation/KingOfTheHill'' had Bill meet and fall in love with a beautiful single mother named Charlene. Dale, suspicious of her daughter, does a DNA test and discovers that she has the same paternal DNA as Joseph, which means they're both [[ChocolateBaby Chocolate Babies]] fathered by John Redcorn. When Hank tells Peggy, she freaks out because the two kids have been getting very close and sends Bobby off to play fifth wheel and prevent anything really {{Squick}}y from happening. In the end, the Hills convince Redcorn to seduce Charlene away from Bill, leading to her moving away.
** Another has Bill visiting relatives in Louisiana. The family manse is home to Bill's aunt, her son Gilbert and three women approximately Bill's age, all of whom have the last name Dauterive. Two of them are the widows of Gilbert's brothers, the other is Gilbert's sister. All three of the younger Dauterive women come on to Bill, who is himself uncertain which of the three is his first cousin. (That only briefly deters him from attempting to have sex with each of them, on the grounds that with each one of them the odds are 2:1 in his favor they ''aren't'' cousins.)
* ''WesternAnimation/OneHundredAndOneDalmatiansTheSeries'' had Two-Tone and Lucky as love interests. They're siblings, though it's never mentioned, and to make matters worse they're not supposed to be NotBloodSiblings; they were of the original 12 pups. It's possible the show did change their bond or the writers assumed she was adopted.

* Parodied in ''WesternAnimation/TwoStupidDogs'' in an episode where the dogs go to live with a family much like the Bradys from ''Series/TheBradyBunch'' (which is about a mixed family so the siblings are not biologically related). The teenage brother and sister get into a fight, before the mom tells them to kiss and make up. They proceed to do so ''literally'' by [[GettingCrapPastTheRadar making out]].
* Played for laughs in ''WesternAnimation/HarveyBirdmanAttorneyAtLaw'' Phil runs away from his wedding to Birdgirl to run off with his sister Phyllis, so revealed because Phil's daughter Judy refered to her as 'Aunt Phyllis'. Given how Phil doesn't know [[ParentalIncest Judy IS Birdgirl]], it was probably for the best. And in case you're wondering what could attract Phil to his sister, she basically looks like Phil with breasts, down to the EyepatchOfPower.

** And in the movie, Lois complains to Peter that, with Chris and Meg around, they have no privacy at all and asks if they shouldn't be dating by now. Of course Peter assumes [[IThoughtYouMeant she meant dating each other]].

*** A reference to the fact that Milhouse's parents look extremely alike. Aside from Milhouse, they're the only naturally blue-haired characters in the series. (Marge dyes, to maintain the naturally blue hair colour she had in her youth. Although in one episode it was revealed she didn't know she'd gone grey, and her hairdresser had been dyeing her hair back to blue for years, with the smell of the chemicals giving her repeated short-term amnesia over the matter.) The episode "Let's Go Fly a Coot" reveals that Milhouse's parents ''are'' cousins, though it's not specified whether they're first cousins or more distantly related than that.
*** Also Chief Wiggum and his wife Sarah, who look like each other and share mannerisms and accents. Like the Van Houtens, they also have blue hair.