The family in “National Lampoon’s Christmas Vacation” is the Griswold family.
The film centers on Clark Griswold, played by Chevy Chase, as he tries to create a perfect old-fashioned Christmas for his wife, Ellen, and their children, Rusty and Audrey. His ambitious plans include finding a large Christmas tree, covering the house in lights, hosting relatives, and preparing for a holiday bonus.
Released in 1989, the movie is the third major installment in the National Lampoon’s Vacation film series. It was inspired by John Hughes’s 1980s National Lampoon story “Christmas ’59,” and it expands the recurring Griswold family’s reputation for turning ordinary trips and celebrations into chaotic disasters.
A common mix-up is “Griswald,” a spelling that appeared in parts of the first Vacation film’s opening sequence and credits. However, the established and accepted spelling in Christmas Vacation is “Griswold.” The extended gathering also includes Cousin Eddie’s family, but Eddie is a relative by marriage and not the main family named in the question.