That’s unfair for your mother to burden you with that huge responsibility. Why is it you over your sisters who can save him? Maybe she has old fashioned views about boys having to be the man of the house. She should never bring her children into it. She should be making the decisions, and protecting you. You just have sympathy for her as she is probably burned out, and out of options, or has too much pride to ask for help outside the family. Your father needs to enter a medical facility on his own and accept treatment. He won’t be able to stop drinking immediately, he’ll need medication to stop the shakes, to slowly take the alcohol from his system. When he’s in remission he will have to attend AA meetings, and speak to others. What is it underlying the drinking? Maybe it is childhood trauma, but he needs to talk about his problems to a stranger outside the family, and not burden you. It’s not your fault, and it’s not your problem. I think you should write a letter to him and a separate letter to your mother telling them how you feel.