I'm not going to say exactly what I think of your father. Since you've explained the situation in a calm and tasteful way, I'll respect the tone you've set. You strike me as quite mature. You do well not to share a lot with your family, since it just becomes ammunition they throw back at you.

What your father is doing is needling you. Then, I guess, the family follows his lead. He feels empowered. The family has decided this is entertaining. It's pathetic. Each of them needs to get a life. You're role is to stay centered and don't take the bait. Sounds to me like you handle this nonsense pretty well.

Someday you'll be out of there and have your own space. Do all you can to aim for that - complete independence. Don't let this stuff corrode your soul. Someday, you'll see your father as a rather small person who'll hope for you to extend some warmth to him.