Peter's very religious father comes to live with the family after he is forced to retire from his lifelong job at the Mill.

Peter decides to pursue his dream career as a knight.

When Peter’s dad comes to visit, he tries to impose his religious beliefs on the family. But after a mix-up with the holy-water leaves Stewie in a bubble, Peter decides to form a church worshiping his hero, the Fonz.

After Peters dad, Francis, dies, Thelma tells him that his real father actually lives in Ireland. So Peter and Brian decide to head there in search of his father, who ends up being the town drunk. They decide to play a drinking game to prove his paternity. Meanwhile, Stewie acts out and Lois spanks him. Realizing that he likes being spanked, Stewie does whatever he can to get into trouble.

When Lois finds a lump on her breast, she goes to the doctor to test for cancer. The tests come back benign, but the doctor looks at her family medical history and reveals some news about Lois' heritage.