High Quality Content by WIKIPEDIA articles! "Peter`s Two Dads" is the tenth episode of season five of Family Guy. The episode originally aired on Fox 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.