Your father sounds like a man who has a mini god personality.
People like him only understand change when you rebel.
They believe everyone is beneath them and no one is as wise as them.
Well the thing is people like this fear public condemnation and such would do anything to be keep their savior personality in the eye of the public.
Well you can change that
Find the one person you know he aspires to become, someone or people he respects and looks up to.
Find that person and you and ur sibling should go to that person and report him.
Tell everyone gory detail and let this person hear you peoples version of your father.
Now because he doesn't want to disappoint this person or group of persons should they be more than one, he will try to make amends.
That is how you fight back for the dignity of you and siblings.
Let him get a taste of his own disdain through the eyes of others and then watch as he will be forced to change because he must keep appearance as worthy man in the eye of the public.
Or ur follow stellas advice, save up move out with your mom and leave him to his misery of growing old alone.
The choice is yours.
