Alright, this is gonna sound ice cold. You don't have to continue being your father's caretaker, under any circumstances, but especially if he's verbally and emotionally abusive. All adult child and parent relationships are opt in, and you can cut them off if they become harmful. So use that, tell him that he can either accept you as you are and keep a civil tongue, or he can look for a new caretaker. It's gonna be hard to face if you do, he will try to guilt you, berate you, or break you until everything is his way. But the end result will either be better behavior from him, or you won't have to care for an abusive jerk.
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