Untitled Griffin Family History is episode 27 of family guy season 04. It was originally aired on May 14, 2006.
When the Griffins get robbed, the family runs into Peter’s panic room to escape the trespassers. Now isolated and trapped, Peter insists the family know about their ancestry and narrates a chain of events in world history that explain the Griffin name. Meanwhile, after Meg is chosen to go back into the house, she scares off the robbers in an unexpected way.