New house. New family. What could possibly go wrong?
Newlyweds Nick and Suzanne decide to move to the suburbs to provide a better life for their two kids. But their idea of a dream home is disturbed by a contractor with a bizarre approach to business.
Kevin McCallister's parents have split up. Now living with his mom, he decides to spend Christmas with his dad at the mansion of his father's rich girlfriend, Natalie. Meanwhile robber Marv Merchants, one of the villains from the first two movies, partners up with a new criminal named Vera to hit Natalie's mansion.
Down-on-their luck brothers, Lars and Ernie Smuntz, aren't happy with the crumbling old mansion they inherit... until they discover the estate is worth millions. Before they can cash in, they have to rid the house of its single, stubborn occupant—a tiny and tenacious mouse.
Steve and Cynthia are a newlywed couple celebrating their first Christmas together. They invite their families to join them for the holidays, but when Steve is laid off just before Christmas and Cynthia discovers she's pregnant, they both keep their news secret in hopes that the celebration runs smoothly.