As far as Shit-Lips and his biological family (other long time Rus-tafarians feel free to correct me if I have the details wrong), I remember it as: Russhole tracks down his biological parents, gets into contact with them, and arranges to travel out to California to meet them in person. It is on this trip that he discovers that he has a fraternal twin sister. Russhole, of course, fixated on her and demands to meet her. The biological mother says she will ask, but doesn't think she will be comfortable with that. Russhole doesn't want to wait and reaches out before the biological parents have a chance to break it to the sister gently. The sister has no desire to meet her wombmate. Russhole flips his shit, ruins any chance of having a healthy relationship with his biological mother (but does manage to scape together some kind of relationship with his biological father), and goes full entitlement lawsperg mode and starts threatening to take his twin sister to court to force her to meet him in person. This causes his biological mother to completely cut Shit-Lips out of her life, saying neither she nor her daughter want to have any contact with Russhole. This sends Dildo Saggins into a narcissist victimhood spiral where he plays the poor picked on victim.
Again, I may have the specifics wrong, as it has been a long time since I read up on Russhole's California Scheming saga, and I welcome anyone to correct me if they have more accurate details. But this is how I remember it going down.