I have spent most of the last decade either alone with ds or just plain alone. I had a couple of Christmas days with my parents when me and ex first split, but during the pandemic just did it for me.
My Dad (he died two years ago) never liked Xmas anyway and I don't live near to them, so Xmas with them always involved me driving hundreds of miles.
My brother lives near them so he always wanted Xmas day at his house. For a number of reasons, staying with him would not have been possible.
So my folks just got into this pattern of going to my brother's and they stopped even asking what my plans were. It really hurt during lockdown when we were allowed to bubble or whatever the stupid rule was, and I hadn't seen anyone other than my child for so long, ....and they booked a hotel near my brother without even telling me. I was so hurt when I found out. Nobody even used to ask if I was alone.
I have had to make my family of two work. I feel sad sometimes that DS hasn't had much of his extended family in his life, but it's just how things are. My parents and brother and me don't really get along all together. My brother demands and my parents would keep the peace, especially my mother.
It got to the point even before my Dad died, that I realised my family had only visited me twice in about six years or more. As of now, I don't expect my mother will be able to visit again and I barely have a relationship with my brother anymore.
I don't have a partner. I have a few good friends but they don't invite me at Xmas either as they all have their own families.
It does hurt and I feel sad how life turned out but also, it isn't the end of the world. There is strength and peace in being ok with your own company.
Let them go, and don't worry about it. Try and plan something nice for you and your DS and especially for yourself. You're not the only one, I promise you.