The relationship between you and your patents plus that of your siblings (and extended family if that’s the case) will very likely be the same for as it’s been for so many others. My guess is that you desperately want to be treated with more love and respect than you have been throughout your life and this situation has brought the inability to have meaningful and helpful conversations with any number of them is eating you up inside.
There’s a lot of things you can do over this Thanksgiving weekend and if you are so annoyed with them that you don’t want to even see them tomorrow then go with your gut and skip it tomorrow. But I would advise you to let them know that you were hurt by how they treated you during a very difficult time in your life and that’s the reason why you aren’t coming.
I’m guessing you’re probably around a generation younger than me and I can tell you from experience that I would do anything to have done something like this decades ago but I didn’t mainly because of my mother.
If you have not let anyone know yet you can do it tomorrow morning if that’s not too late. You might get some major pushback depending upon the personalities of your family but stick to your guns. Planting a flag now is better than anything you could ever say and definitely keep your cool.
I’m assuming a lot not knowing you at all but I’m familiar with the dread of seeing some of my family at certain times so I hope you can find some peace this weekend. If you have a good mate, call them up to tell them what happened and if he wants to hit a bar, hang out, go for a run, something so you’re not at home stuck with your thoughts. Don’t go to the hospital or a medical facility unless you are in danger. This will pass and you’ll become a stronger man from it. Please reply back if you have any questions or something else to say about this.