I am kinda of in the same boat as you pal.
I am, however, married and have made by Wife's parents kind of my new parents.
We never have to argue who's parents house we have to go too at least
I havent spoken to my mom for over 6-7 years, she remarried a class jerk and never even came to my wedding, her hubby has beef withe me, well jelousy really.
She had never met my wife.
She is in a unhappy marriage now but wont leave.
My old man and I get along just fine, go for lunch once a week, but he too is in a unhappy marriage and his wife has a complex with me.
I'm the only child.
Sorry for the rant, only reason for it, I have a strong grasp of what you have gone through especailly in times like these where xmas is labelled as family get togethers.
Before I was married, I had sleepless nights on holidays becuase I had no where to go, but soon relaezed, I enjoy my own company, it made my skin thicker.
Just like you, I had in the past grabbed a nice meal, a little weed or soemthing and booked a hotel, nothing wrong with that at all man, been there dont that!
Wishing you the best.