The Nerdy altar boy, Michael "P.N." O'Rourke, and his two stepsisters Brianna, Sabrina, and Stephanie, try to convince their mother, Miss Watson, that they can be the new bride and groom if Miss Watson doesn't come to the wedding. This is when stepmother is away, but when stepbro gets a call from her, he decides to show up in the bride's honor, so as to see if the cat will indeed jump on the bride.