Vestigial Peter
After a vestigial twin grows out of Peter's neck, which he names Chip, he eventually starts realizing that people like Chip more than they like him, so Peter has him amputated. However, after Peter gets into trouble, he realizes he needs Chip more than ever.
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Family Guy Season 12
Family Guy Episode 2
When Lois tries to get Peter ready for church, she complains that he keeps wearing the same old shirt and insists that he go to the mall afterward to get new clothes. Trying on a new shirt, the salesman points out a lump on Peter's neck and Lois insists on seeing Dr. Hartman. The doctor identifies it as a vestigial conjoined twin and extracts it from just beneath Peter's skin so that it can talk and react to people as Peter names him Chip. Taking it home, he frightens the kids at first but soon gets everyone to warm up to him. But when Chip wants to live an active life, Peter tries to get him to slow down and Lois objects to him trying to stifle Chip. Chip also gets lucky with Peter's boss Angela and eventually gets on Peter's nerves.
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Peter goes back to Dr. Hartman and requests to have Chip removed despite possible risks to his own life. The operation is a success and they become separate entities. Despite Peter's attempt to encourage Chip to go his own way, the family insists Chip stay with them. Chip endears him to the family further when he rearranges the home and spends time with the family. Lois points out that Peter was once as full of life as Chip. Peter decides to get rid of him and tries to have him eaten by a dingo. While the attempt fails, Chip realizes he isn't wanted and leaves. Peter breaks the news to the family and they go search for Chip, leaving Peter alone. Going to the basement, Peter falls down the stairs and breaks his leg. Chip returns and finds Peter, making a splint for his leg and drags him back upstairs. Peter is grateful for what Chip did and makes up with him. Chip decides to go out in the world and experience it for himself, sailing himself aloft on a balloon where he became the kid on ABC's The Middle.