Frank announces that he has decided to compete in the church boxing tournament, making it obvious that he's playing for Mike's affections. When Frank can't cut it, Timmy steps in and takes up boxing in order to bond with his dad and get his approval. Ultimately, he has to choose between his dad's dreams for him and his own dreams of showbiz glory. Elsewhere, feeling rusty after being at the seminary for so long, Lawrence asks Eddie to help prepare him for a date by taking him on a "practice date".

Mike and Peggy think they might be expecting again, but later Peggy is diagnosed with having a cyst instead. The experience launches them into a debate about whether or not they should have another child. Meanwhile, the kids spy on Mike and Peggy to try to figure out what all their unusual behavior is about. When Pat overhears that they are going to have a little sister, the Cleary kids decide to dig deeper and continue their investigation, which only leads them on a downward spiral.