Who Is the Real Grandpa in Family Guy? the Untold Story Behind Peter Griffin’s Fathers

Is who Is the Real Grandpa in Family Guy? the Untold Story Behind Peter Griffin’s Fathers something you want to understand? Find out the complete facts in our feature story.

Q1: Who is Stewie Griffin's true biological grandfather?

Stewie has two distinct biological grandfathers. On his mother Lois's side, his biological grandfather is billionaire industrialist Carter Pewterschmidt. On his father Peter's side, his biological grandfather is Mickey McFinnigan, the village drunk of Inishmore, Ireland. Francis Griffin was merely Peter's legal, non-biological father.

Q2: In which episode does Peter Griffin discover his real dad?

Peter learns the truth in season 5, episode 10, titled "Peter's Two Dads." The revelation occurs directly following the death of Francis Griffin, when Thelma Griffin confesses that Peter was conceived during a vacation fling in Ireland decades earlier.

Q3: Did Mickey McFinnigan ever return to Quahog?

Mickey has made very few physical appearances outside of his debut in season 5. He appeared briefly via photographic references, hallucinations, and minor callbacks in later seasons, preferring to remain in Inishmore rather than integrate into the everyday life of the Griffin family in Rhode Island.

Q4: Why did Francis Griffin raise Peter if he wasn't the father?

Francis was an ultra-devout, traditional Roman Catholic. Acknowledging that his wife, Thelma, had an affair resulting in an illegitimate child would have invited intolerable social and religious scandal. Out of religious obligation and marital appearance, Francis raised Peter under strict Catholic doctrine while quietly harboring intense resentment toward him.