I'm sorry that they induce that much stress and irritation. I feel your pain.
I have alcoholic parents and I had to stop doing holidays, then eventually everything with them. They never wanted to get better, don't think they have a problem, and alcohol is always the fix it for whatever your ailment! They think it's okay to drink with my sister that is on anti-anxiety/depression meds. I tried having a relationship with them, and every time, the same results, so I just had to stop. They can all communicate with me via email, but that is it.