Patty and Cathy have a slumber party at their house for some of their girlfriends. Richard, Henry, Tom and another boy show up at the door, before the party starts.
Little brother Ross tapes the girls' conversations during the party and uses it for blackmail against Patty and Cathy.
The 2 cousins end up doing his chores, to keep Ross from playing the tape to others, and wait on him constantly. Patty and Cathy turn the table on Ross and everything works out fine in the end for the entire Lane family.