Richie wants to move to North Dakota and Jan discovers she's pregnant; Sonny gets a new agent; Nancy and Howard ponder getting a home security system.
For such a big event, this is an underwhelming episode. Sonny's B-story takes up a larger chunk of it. His new agent refers to Nancy as "Broom Hilda" and Sonny really tells Nancy off good and storms out. The scene at the kid's birthday party has a funny moment when Sonny's about to sing a song from La Cage aux Folles and stops himself from stating the content of the play in front of the kids.
For such a life-changing event, very little of the episode is devoted to Jan.