who played marty in christmas with the kranks

I'm not sure about the specific role of "Marty" in the movie "Christmas with the Kranks", but I can provide some information about the movie if you'd like. "Christmas with the Kranks" is a 2004 American Christmas comedy film directed by Joe Roth and starring Tim Allen and Jamie Lee Curtis. The film tells the story of a married couple who decide to skip Christmas and go on a tropical vacation instead, much to the dismay of their neighbors and friends.