I'm sorry to hear about how difficult the holidays are for you and how your family makes it worse. I can relate.
As a child, I always wanted the heart warming holiday scenarios you see on TV. Every year I would get all excited, hoping that this was going to be the year. Every year, I was bitterly disappointed. When my family would get together, it would always end up in a huge argument with everyone storming off and not speaking to each other for several months. Every year there were always one or two people that were absent from our get togethers because so and so wasn't speaking to so-and-so, etc.
By the time I was a teenager, I loathed the holidays and was perfectly happy to spend them alone, even if it meant I had to eat a TV dinner by myself. At least it was peaceful, no shouting or bickering over all kinds of stupid crap that doesn't even matter.
In college, I had friends who I would get together with and we would have anti-holiday celebrations. Those weren't too bad and usually involved a lot of drinking.
Finally, I met my husband and I learned what having a happy holiday season really means. My husband and I had some wonderful holidays together. Our favorite holidays were our wedding anniversary, Dec 27th, & New Year's Eve. But he also managed to make my Thanksgiving, Christmas, and Valentine's days special as well. The only time I ever looked forward to holidays or really enjoyed them was when I could celebrate with my husband.
This holiday season will be the 3rd one in a row, and hopefully my last one, without him.
(He passed away on October 15, 2017)
For the last two years, I have avoided all holiday related things. I haven't watched any holiday specials, or put up a tree, or done anything else. I've actually spent the last 2 Christmas Eve/Christmas Days, Wedding Anniversaries & New Year's Eve/New Year's Days either watching non-holiday movies & tv shows while stuffing myself with food until I threw up or drinking until I passed out.
This year, since I intend it to be my last holiday season, I may attempt to watch a few of the holiday shows that I used to watch with my husband (if I can stand it and it doesn't get me too upset). For my anniversary and New Year's Eve, I will most likely do what I usually do and drink until I pass out. I may also take a couple of Benzos or something to help me sleep for a day or two so that I won't have to be awake, particularly for my wedding anniversary.
I don't have to do family get togethers anymore because all of my family is pretty much dead now. I much prefer to spend it by myself anyway just being able to do what I want to do when I want to do it. Some people may find it sad that I spend holidays alone, but I much prefer that to being around a bunch of people who will probably be talking about stuff that I don't care about anyway.
I used to do similar things to what you were talking about with buying the nativity scene and so forth to try to alleviate my loneliness and depression during the holidays before I met my husband. I remember I used to have a little table top Christmas tree that I would put out every year. I don't really bother with any of that stuff anymore because I don't have the energy to put those things up, only to have to take them down a few weeks later. That is too much energy for me to exert these days.
Another thing I like to do that I haven't done in the last couple of years is listen to Christmas music. A lot of the Christmas music I listen to is Christmas comedy music, like the songs they used to play on the Dr. Demento radio show. I don't know if you're familiar with that or not. I have a CD that's called "Twisted Christmas" by the Bob Rivers Comedy Corp. I believe they're a comedy troupe from Canada. Anyway, I like Christmas music like that that's funny. Or old songs like "All I Want For Christmas Is My Two Front Teeth" by Spike Jones. Then, of course, there's the old rock 'n' roll Christmas songs like "Run, Run, Rudolph" by Chuck Berry.
So I think I'll gather up all the movies and music, both Christmas and non-Christmas, that I want to watch and listen to between now and early January when I plan to ctb.
I'm going to try to watch all my favorite movies, listen to all my favorite songs, eat all my favorite foods, and just have as pleasant of a holiday season as I can. It may actually be a little more pleasant this year since I know this will most definitely be my last one. Part of what used to bother me was every year I would think. "God, not this again! How many more times do I have to endure this?".
This year I will know I won't ever have to endure it again. That might actually make it a little easier.
I hope you find some ways to get through the holiday season and to make it easier on yourself. Good luck.