Maggie goes into labor. Mike and Maggie decide to go away for the weekend despite it being too close to their new baby's birth. Jack and Sean meanwhile arrange to have a party during their parents' absence. But their plan is interrupted when Mike and Maggie return because Maggie's having labour pains.
Mike and Maggie's decision to spend the weekend at a lakeside cottage is met with mixed reaction by the family.
Concerned Mo thinks it would be better if Maggie stayed home since Maggie's baby is due quite soon. But Sean, Jack, Max and R.J. see it as a chance to do the things they haven't been able to do because their parents are around.
While Sean and Jack plan a party, Max and R.J. have already decided to bring the class guinea pigs home.
At the same time, Sean and Jack, knowing that they will not be able to have a good time with Max and Mo in the house, have made plans to get the two out of the way.
The result Is a lot of commotion in the house — Sean and Jack making the party preparations, Max and R.J. having a guinea pig race in the kitchen, and Mo preparing for her date with a football star her brothers have fixed up for her.
Mike and Maggie walk into all these when they return suddenly because the latter is having labour pains....