Dave Griffin was Stewie Griffin's twin brother that died during childbirth.
When Brian insults Stewie for listening to Anne Murray in "Chris Cross", Stewie tries to convince him to give it a try. When Brian continues to doubt that he can be won over, Stewie assures him that he can make things happen. A cutaway gag shows the birth of Stewie, but the doctor pulls out a tiny coffin during the birth of Dave, to Stewie's mock surprise.