Family Guy Season Six Episode 10.

Peter constantly hangs out with his friends, ignoring Lois.
Brian has won a reward for his essay and invites
Peter and Lois to the awarding ceremony. Peter is unable to stay sober after arriving at the hotel, so Brian takes Lois out to have fun. That night, Brian sexually harasses Lois while they are watching a movie. A fight ensues after Peter accuses Brian of his inappropriate act.
Brian apologizes to Lois, who forgives him.

While Peter and Lois are on vacation, Herbert is enlisted to babysit the children. Chris eventually suspects that Herbert is a pedophile.