This Christmas thing is really tricky. When my DH and I got together we did the 'one year at his, one year with my mother' thing. Of course one enjoys one's own family Christmas best. The DH's mother was pretty eccentric and one year wouldn't put the heating on so I froze, being a cold mortal anyway. Still, it was fair. When we had children we stayed put.
With my own DD, when she met her DP, now her DH, she came to us for Christmas as she couldn't bear to be away for it but spent the time missing him awfully.
Then two years ago she went to his parents' for Christmas and then he came to ours last year.
They married in June and it is planned that they will go to his parents again this year. She found staying there very hard. His DF is a difficult character and the house is very chaotic with no haven for her to retreat to. The DH's old bedroom is small, grubby and full of junk so she was not comfortable. Family traditions were very different. For example, presents were not opened until after dinner and were opened turn by turn from each person at 7 in the evening. On the plus side the meal was plentiful and the drinks flowed freely and no one objected to the young couple going for a walk round their village and visiting old friends.
Ay home we have a quiet day with presents in the morning, a fab 'light lunch', a village walk, Christmas cake at tea time and Christmas dinner at 7p.m. I can see that for her new DH this would be as unfamiliar as his family Christmas is for her but they come and go as they please and her room is big, clean and welcoming.
Their own house is nice but not big enough to entertain 11 people and, while it is near us, it is a hour from the DH's parents (who want to be in their own house anyway.) They were thinking of moving to a bigger place which would have been ideal for hosting but they have put their plans on hold for now.
Nothing is ideal but it is a case of preferences, not needs. Everyone has to compromise, hold their tongues, take turns and defer at Christmas. I am bereft without my DD at Christmas but I realise I have to, in the phrase, 'suck it up' to ensure harmony and equity. In fact I have to be extra cheerful to ensure my DH and DS have a good time with only three of us in the house.
I think the OP will have to take turns and make the best of it. Think of things to do to make the situation better. I find that copious amounts of Champagne usually oil the wheels.