I don't want my divorced parents to come together in the same house this year on christmas morning
What is the issue with your divorced parents getting together.
I just do not think I will be able to feel comfortable this year if they are in the same house.
It sounds like there is some stress in your family. It is good if you can find a way to spend time together on the holidays. These are important times to make memories.
The problem is that they are only coming back together because they have to spend time with me. I don't have a say in the matter.
It is understandable that you would rather not feel uncomfortable over the christmas holiday. It may be worth talking to your parents and letting them know how you feel when they are tense around one another. If they can not fix them, you should have the right to ask to spend time with them one at a time.