Peter MacDougall is Amy's very geeky older brother and the son of Hank and Pat MacDougall. In early episodes, he revealed his dislike of his current brother-in-law, Robert Barone, and his behavior often repelled the rest of the Barones, despite his conflict with Robert, it was noted that the two have more in common than they think with the most common aspect being that the two were overshadowed by their younger sibling and got along better after realizing this (this revealed Amy to be the favorite child of the MacDougall family). He owns a comic book store that now belongs in Robert's old apartment on Long Island. He owns a cat named Miss Puss and a pet snake, and he is in a relationship with Peggy after finding out she was a nerd too.