Bridget Connolly (Patty Duke) and Betsy Lucas (Shelley Long) are two social climbing society women from Santa Catalina Island, California who have been continuous rivals for some unknown reason. But when Betsy's son Mark falls in love with the girl next door—who happens to be Bridget's daughter Theresa—the two women put all of their energy in to planning the wedding, much to the chagrin of their children.