In National Lampoon's Christmas Vacation, Clark's family surname is Griswold.
Clark Griswold is the central character in the Vacation film series, played by Chevy Chase. In this Christmas entry, he wants to give his family an old-fashioned holiday, but preparations at the Griswold home spiral into decorating disasters, unwanted guests, and an anticipated bonus that does not arrive as expected.
The film is based on John Hughes's short story “Christmas '59,” which appeared in National Lampoon magazine. Hughes also wrote the screenplay, while Jeremiah S. Chechik directed the movie. Beverly D'Angelo plays Ellen Griswold, Clark's wife, and their children are Rusty and Audrey.
A common mix-up is to confuse this family with the McCallisters from Home Alone or the Parkers from A Christmas Story. National Lampoon's Christmas Vacation was released in 1989 and became a recurring holiday favorite despite receiving mixed reviews initially.