check this out. thought it up while watching KOTH(king of the hill) the other day. here goes:

Basis of theory: There has always been the underlying issue of whether or not Bobby is truly Hank's son, due to many factors that are valid and seem to present themselves in the show. first reason: Hank's narrow urethra and the Hill's initial struggle to get pregnant. especially when they are told one episode that they won't be able to conceive because of that. 2nd Reason:Bobby shares absolutely no physical traits with Hank, he is unathletic, unaggressive, non confrontational, he's pudgy, acts like a boob, always eating or snacking. 3rd reason: Bill and Peggy have an awkwardly deep and a weird dynamic, especially when they're alone. it's common knowledge Bill loves Peggy as he makes it known a lot. Peggy treats him as if he's something she is ashamed of for some reason. Outcome here is that Bill is Bobby's father, product of an intended one night stand impregnation of Peggy and treated as Hank's. a la Nancy, Dale, and John Redcorn. so it is kept secret by both parties throughout the original series.

Fast forward 21 or so years into the future, Bobby, a failed Prop comic, comes back to Arlen to be a stand up comic at a club in Arlen. Most of the gang is there, except Luanne, Lucky and like Connie. Have the first conflict be that for Bobby's return party/BBQ, Bill gets Shit Faced, to the point where he gets outwardly upset at Hank for some petty shit, and then after a Peggy slight or Insult of him, he gets belligerent and starts bringing the truth to light regarding Bobby's true Paternity. Peggy diputes this only to be confirmed by Dale, saying thag he was always a little bit suspicious about one of the kids in the neighborhood being illegitimate and he tested Connie and Bobby because he knew that Joseph was his son from the aliens. Take that and the fact that the world is so Woke now, that the Hills and friends should struggle pretty hard in a lot of areas due of everyday life. so examine that as well.