The children haunt the house to frighten away prospective buyers.
The kids are at each others' throats because the house is seemingly too small with six kids sharing two bedrooms and one bathroom, two of the three doors to which are often locked when the bathroom isn't in use. Mike and Carol have previously talked about buying a larger house, but they haven't seen one they both like and can afford. That changes when Mike places an offer on a house they have previously admired that has just come on the market.
At the same time, strange noises seem to be emanating from their own house. Mike, who hasn't been around when the noises are happening, suspects that it is just the house settling. Carol, Alice and the kids, all frightened, aren't too sure about Mike's assessment as some of the noises sound otherworldly. Carol just hopes that the noises subside when Mr. Grossman, their realtor, brings by Mrs. Hunsaker, the first prospective buyer of their house. The kids have second thoughts and pretend to be ghosts, in order to scare off would-be buyers. The kids' efforts succeed, while Mike realizes how much they like the current home, even with the lack of space.