This question contains spoilers…
(view spoiler)[On Christmas Eve Tessa went out and picked up some pies that she had ordered for Christmas. Who came to Tessa's for Christmas dinner? Nick was no longer living at home. Tessa's brother and Mother were in New York. Nick's parents wouldn't have been there if Nick wasn't. Tessa's Dad didn't know about the separation. Did Tessa and her children spend Christmas alone? Who ate all of those pies? (hide spoiler)]
Marjie Tessa and the kids could have eaten them, the babysitter, Nick (who spent time at the house with the kids) probably would have eaten the pie ordered for him. They could have been gifts to others or brought to a neighborhood potluck. Tessa could have shared them with friends or just thrown them in the trash.