My father is sadist, how can I change him?

You can't change him, but you can give him a dose of his own medicine...publically demean and humiliate him right after he does it to you. I'm sure he has something mildly embarring you could reveal about him.,,then just innocently tell him, it's what you do to me, I figured it was proper and okay. If he doesn't get the message, keep doing it, revealing things that are more and more embarring, if he tells you it's wrong, then ask him why it's okay for him to do it.