Legs Go All The Way Up Griffin is Peter Griffin's great-aunt. Her legs indeed go all the way up. In "Amish Guy", Peter pledges to lose weight in order to ride a roller coaster in Columbus, OH. He insists that when he gets done he'll look as good as his great-aunt. However, when his great-aunt shows off her legs in a cutaway gag, a passer-by reacts in horror, calling her a monster. She is voiced by Seth MacFarlane.