who is ruby sue in christmas vacation

Ruby Sue is a minor character in the 1989 Christmas comedy film "National Lampoon's Christmas Vacation." She is the young daughter of Cousin Eddie and his wife, Catherine, who is introduced during the family's chaotic holiday gathering. Ruby Sue is portrayed by a young actress named Julie Ann Emery, who also played a young Ruby Sue in the 2014 direct-to-video prequel, "National Lampoon's Vacation: Family Reunion."