During their vacations in Jamaica, contractor Frank Lambert and widowed beautician Carol Foster get married. When they return to their hometown, Port Washington, Wisconsin, they need to slowly introduce their very different children. Their plan is to make the children think they are dating but Frank accidentally tells the truth (that they are married) and there is nothing to hide so eventually the Lamberts move to the Foster's house. Later, as a sign of ""step-maternal"" love, Carol believes Al is having a pain that is hurting her (something Frank never believed) and she takes her to the hospital; the pain results to be a appendix and they remove it.