Christine's desire to fit in better at school leads her to join a sorority, which in turns leads Jimmy to beg her to come home so he doesn't have to take care of the kids. After seeing Christine rack her brains trying to study for a test and hearing Greg and Kim talk about the study groups they had, Jimmy tells his wife that she should join a study group. Christine doesn't want to join anything where she'll feel like a square peg, but Jimmy is persuasive enough that she gives her younger classmates' group a shot. She gets cold feet when Jimmy drives her there, and she sees the group is in a sorority house. But, because of Jimmy, she marches right into Phi Sigma Gamma and introduces herself to the sisters, who are in the middle of pledging some new blood. The girls hit it off, and after studying economics, the chapter president, Katie, and her right-hand sister, Maryanne, ask Christine to join the sorority. Since Christine already bore witness to what the pledges have to do (like be hum