Christmas gets off to a bad start for Jackie when Martin brings a huge tree into the house. It gets worse for everybody when, along with nice grandma, Martin's mother Horrible Grandma arrives for the day. She brings no presents as usual but her own sherry and her own turkey as Jackie's is too dry, along with her dog Boudacea, who is so old and ill she needs an oxygen mask. Sadly, Jackie's turkey is indeed dry, causing Adam to choke and Martin to use Boudacea's oxygen mask to revive him, which does not please her owner and leads to a fight between the two grandmas. Martin manages to make his mother laugh but then the tree intervenes, though Jim, disguised as Santa Claus, manages to bring a little seasonal peace to the gathering.