I can’t take much more

My dad is very sick with kidney failure and he has high blood pressure, on dialysis and is very sick. He won’t do the right things and he is very manipulative, I can’t take much more. Everyday he screams at us and then plays the victim. My mom even learned to do home dialysis for him, so he would be comfortable at home, he said “anyone would do that” and what she did wasn’t special and he doesn’t care. I’m only 17 and it’s very hard to watch his happen everyday, I’m close to giving up but I’m scared because I know it’s not Gods will and I don’t wanna make things harder on my parents.