Family Guy: Season 14, Episode 6

14 - 6: Peter's Sister

Peter's sister, Karen, visits for Thanksgiving and bullies Peter the same way he treats Meg. At first, Meg is amused, but she soon helps Peter train to defeat his sister in a wrestling match.

Meanwhile, to avoid overeating on Thanksgiving, Stewie and Brian go on a cleanse, which Stewie takes one step too far