"Peter's Two Dads" is the tenth episode in the fifth season of the American animated television series Family Guy. It originally aired on the Fox network in the United States on February 11, 2007. The plot follows Peter traveling to Ireland to find his biological father, after he accidentally kills his stepfather at his daughter's birthday party. Meanwhile, Stewie undergoes a phase of selfishness, believing everything belongs to him. This results in Lois spanking him, which makes him realize he is a masochist. Also, Meg turns 17 in the episode.