High schooler Grover Beindorf and his younger sister, Stacy, decide that their parents (Jamie Lee Curtis and Kevin Pollak) are acting childishly when they announce they're divorcing after 18 years of marriage -- so, the kids lock mom and dad in the basement until they sort out their problems. Grover and Stacy's friends follow suit, and soon, the Beindorf basement is overflowing with the neighborhood's discontented couples!

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