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 surprises her with the news that she's Jewish. Peter takes to the family's newfound faith a little too eagerly, but when he is visited by the ghost of his father who reminds him to be faithful to his religious identity, he turns on Lois. After a visit from Jesus sets him straight, Peter and Lois agree to go back to the way things were.