"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, after Lois spanks him, Stewie becomes fascinated with it and goes to great lengths to have her hit him again.