how is eddie related to clark in christmas vacation

Eddie is Clark's cousin in the "Christmas Vacation" movie. He is a side character who adds some humor and chaos to the story, but he is not directly related to Clark's children. Eddie is the older cousin who shows up unexpectedly at the family Christmas gathering, and he causes a lot of trouble with his antics and jokes. However, he does have a good heart and tries to help out in his own way, making him a likable character despite his flaws.