How you and your mother are still surviving with that beast? I am so sorry but your father deserves this name calling. I really feel sad for you and I am so sorry what you have (are) going through with it. Are you and your mother completely dependable on your father's income? And what are you doing? As in studies? Are you done with your grad school? If no and you are still dependable on your father, I would suggest please stay with him only few more years until you are graduated. As soon as you are done with your studies and find a reasonable job for you, leave him and go somewhere else. I will pray for you and your mother. I know its not easy for you and your mother, but you have tolerated all this, please adjust some more time (try not to argue with him, whatever he say obey him temporarily). Find a job and kick his house..
btw you don't have any relatives who can afford you and your mother? Like your mom side family? Aren't they know about it? Will they cooperate if you let them know? If you have supporting relatives, please aware them what you and your mom are facing. Don't neglect it. Your father deserves embarrassment in front of everyone.
I really hope you and your mother get a suitable solution for this. Don't you have any relatives who can afford your mother's treatment? Your grandparents?