Ep 10. Peter's Two Dads

In season 5 episode 10 of Family Guy, titled Peter's Two Dads, Peter's mother Thelma reveals to him that his real father is actually a man named Mickey McFinnigan, and not the man who raised him, Francis. Peter decides to track down Mickey, who turns out to be a rich and successful man living in Ireland.

Excited to meet his real dad, Peter and Brian fly to Ireland to meet Mickey and his family, including his half-brother Patrick. However, when Peter finally meets Mickey, he realizes that he doesn't quite live up to the expectations he had in his head. Mickey turns out to be a heavy drinker and womanizer, and Peter quickly becomes disillusioned with him.

At the same time, Peter and Brian also meet Mickey's other son, Patrick, who is more responsible and successful than Mickey. Patrick takes Peter and Brian on a tour of Ireland, where they visit an Irish pub and learn about the country's history and culture.

Meanwhile, back in Quahog, Lois realizes that she may have made a mistake in letting Peter go to Ireland and decides to try and bring him back home. With the help of Chris and Stewie, who use their talents to make a heartfelt video for Peter, Lois convinces him to return home.

When Peter returns home, he realizes that while Francis may not have been his biological father, he was the one who raised him and loved him as his own. In a touching moment, Peter tells Francis that he will always consider him his dad, and the two reconcile.

Overall, Peter's Two Dads is a heartfelt episode that explores the complexities of family and the importance of love and acceptance. It also features some humorous moments, such as Peter's hilariously stereotypical expectations of his Irish heritage and Patrick's attempts to "woo" Lois.