Tangled Family Tree / Western Animation

• Adventure Time isn't that bad◊. For starters, Jake the dog is the son of Joshua, who was impregnated by an alien and has a half twin brother. Jake himself is already a grandfather thanks to his children undergoing Rapid Aging. Meanwhile, his adoptive brother Finn has a "son" with Princess Bubblegum, might have a family in a parallel world, and has a plant clone named Fern. As for Princess Bubblegum, she's technically the mother of the entire Candy Kingdom, including her "uncle" Gumbald.
• In the The Amazing World of Gumball episode "The Signature," Richard adopts his mother's (Granny Jojo) seventy-two-year-old fiance, Louie, in order to stop them from getting married. This makes Louie the brother of Gumball, Darwin, and Anais (Richard's children), and it gets weirder when Louie adopts Richard's wife Nicole. This means Nicole is married to her own grandfather, and Granny Jojo is engaged to hers. It also means that Nicole's the niece to her own children. They end up sorting it out by finding Richard's estranged father.
• The Cleveland Show is about a fairly typical blended family (mother of two marries a father of one), but in the final episode, Donna's ex-husband Robert hooks up with her mother Dee Dee and the pair adopt a Chinese child, greatly upsetting the family. Rollo is especially frustrated because he's supposed to make a family tree for school, and now he has to figure out a way to make his grandma his stepmom, his dad a grandparent, and add an uncle his own age who's also his half-brother. Eventually he gets so annoyed that he rips it up.
• DuckTales (2017) brings this back to the Duck family, by virtue of doing its best to follow the original Carl Barks and Don Rosa comics. Lampshaded in the episode "Last Christmas" where a time-displaced Dewey tells a young Donald that he's "your fifteenth step-cousin on your great-grandmother's niece's side from... Canada."
  Donald: Ugggh, this is the most confusing family.
• Family Guy:
  • The Griffin family tree is a convoluted mess. Besides the standard nuclear family of Peter, his wife Lois, and their three children, countless relatives of his (his brother Thaddeus, sister Karen, broster, and vestigial twin Chip included) have come and gone over the years, especially ancestors who only appear in cutaway gags. One of his ancestors, Nate Griffin, even had children with one of Lois's ancestors, Lois Laura Bush Lynne Cheney Pewterschmidt, which somehow makes Peter and Lois Kissing Cousins. There have also been mentions of them having other children that either died in infancy, were stillborn, or miscarried (albeit mostly in cutaway gags). We're not even getting into the offspring Stewie had with Brian (who, by the way, is a dog) in "Stewie is Enceinte" (with said offspring being half-siblings to Brian's son Dylan), his clones, his half-brother Bertram, his other half-siblings in "A House Full of Peters" (and God knows how many other half-siblings he might have out there after Peter's mishap at the sperm bank), or his ancestor Leonardo da Vinci. (To top it all off, after Bertram killed Leonardo, Stewie had to become his own ancestor in "The Big Bang Theory" in order to salvage his chances of being born and save the universe, which he inadvertently created in that same episode.) Did we mention Peter's biological father is Mickey McFinnigan?
  • How about Peter and Lois being reincarnations of Quahog's founder Griffin Peterson and his true love, Lady Redbush? As unbelievable as that sounds, it should also be noted that they each married a (possible) previous incarnation of Meg and Stewie before finding each other again. Oh, and don't forget the kids Lois had with Quagmire in an alternate timeline... or the many different versions of the Griffin family that live in alternate universes as seen in "Road to the Multiverse."
  • That's not even getting into non-blood relations. In one episode, when Tom Tucker was dating Peter's mother Thelma, he was technically Peter's stepfather (which made his son, Jake, Peter's stepbrother). Another episode saw Tricia Takanawa technically become the stepmother of Lois, her sister Carol, and her brother Patrick during the brief time she dated Carter Pewterschmidt. Carol herself had once been married to Mayor West, who was her tenth husband and the stepfather of her son who made his only appearance in "Emission Impossible". Brian married and later divorced Lois in "The Perfect Castaway," which temporarily made him the stepfather of Meg, Chris, and Stewie; this also made Dylan their stepbrother. At one point, in "Peterotica", Babs Pewterschmidt divorced her husband Carter and married Ted Turner, the same man who'd impregnated Seabreeze (who, like Brian, is also a dog) with his puppies in an earlier episode.
• Futurama brings us Fry's family tree, seen here.
  • To be more specific, Fry became his own grandfather after doing "the nasty in the pasty" in "Roswell That Ends Well". This means that his father/son Yancy Sr. is also his own grandfather, resulting in his family tree becoming an infinite loop. Fry being a case of My Own Grampa is actually a plot point.
• Infinity Train presents a car in the second season that contains a literal family tree, wherein the families are in constant argument over their descendants marrying a century ago.
• In The Oblongs, we are given a glimpse of the Oblong family tree. Given that nearly the entire current generation is made up of people with deformities and/or missing limbs, it is understandably messed up, but the fact that some of the family members were in Hiroshima around the time of the A-Bomb's detonation, and were originally traced back to carny folk is quickly eclipsed by the presence of Uncle Kiki, a monkey.
  "As far back as I can trace, my relatives were carnival folk who were touring a place called "Hiroshima" in the summer of 1945. After that, because of their lack of hair and skin, they mostly married each other. And here I am!"
• The Owl House may have a case of Found Family Tree, just take a look for yourself.
• Scooby-Doo, over various spin-offs, has introduced enough cousins, uncles, aunts, nephews, and even siblings of Shaggy, Scooby, Fred, Daphne, and Velma (most of them appearing only once and then never to be seen again) that they probably fall under this trope.
• The Simpsons: The family has a very tangled-up tree. The Simpsons Uncensored Family Album from 1991 gives us the Simpson family tree◊, which doesn't seem too bad. 19 years later, the episode "The Color Yellow" reveals that the Simpsons are descended from an African-American slave named Virgil, who is Abe Simpson's great-great-grandfather. However, in the aforementioned book, his spot on the family tree is instead occupied by Garwood Simpson. Furthermore, Virgil's son, Abraham Simpson I, conflicts with Howland Simpson. It has never been made clear which interpretation of the Simpson family tree is canon.
• The Venture Bros. is far from the most egregious example, as Jonas Venture currently has only six known descendants. That said, exactly half of those relationships were plot-twists. JJ's existence was a plot twist, and the Monarch and Dermott being Jonas Sr. and Doc's bastards, respectively, were major twists. Although, in Dermott's case, the plot was not so much that Dermott was a Venture, which had minimal plot relevance, but that Doc had slept with an underaged girl.
• WordGirl: In the final season episode "The Ordinary, Extraordinary Botsfords," Todd and Violet's family trees apparently suggest that their parents are brother and sister. This is the only time incest is implied in the whole series. Here's Todd's tree◊ and here's Violet's tree.◊