amily Guy Season 9 Episode 3 (Family Guy s09e03) with title “Welcome Back, Carter” aired on Sunday, October 10th 2010 at 09:00 pm via FOX Network.
Here is summary for Family Guy Season 9 Episode 3 :

After Peter catches Lois’ dad, Carter, having an affair, he is strong-armed into keeping a secret. But when Peter accidentally spills the beans, Lois’ mom demands a divorce, and Peter is in charge of Carter’s return to bachelorhood