Rich Man, Poor Man (1976)

S12E8 Christmas Guy

When Carter Pewterschmidt decides to call off the yearly Christmas carnival in Quahog due to his dislike for the holiday, Peter takes on the challenge of changing his father-in-law from a Grinch into a local legend to save the celebration. At the same time, Stewie hatches an elaborate scheme to secure the one special item he desires for Christmas.