The Grimleys (1999)

S2E15 Christmas with the Addams Family

Uncle Fester is selected to descend the chimney dressed as Santa Claus to demonstrate that Santa is real for the kids. However, he ends up getting wedged in the chimney. In a bid to save the day, Gomez, Lurch, Cousin Itt, and even Morticia and Grandmama all put on red suits to surprise the children.