It's been a really rough time, with me supporting us both on a modest wage (he quit his job to study, and has been unable to get part time work).
It has been my experience that when an alcoholic quits their job it usually doesn’t have anything at all to do with studying, going back to school, learning a new trade, etc. it’s all about DRINKING with nothing to get in the way of that. Ask yourself honestly about his “studying” and where that’s gotten the both of you.
His drinking and your decision have taken you away from precious time with your father and can only lead to resentment down the road.
You mentioned that you have attended counselling and Al-anon as if in the past tense. Are you actively in al-anon today and seeking therapy?
What is his response to getting a job and taking some of that financial burden off of your shoulders?