You can't do much about his character but you can choose your reaction following his horrible action. What do you want to do? Beat him back, insult him, or worse kill him? Steal from him?
The only thing I can advice is that you plant a camera in the house and use the videos as evidence to support your abuse claim when you want to report to outsiders. You might want to do soemthing as drastix as posting such on social media and calling for help.
I also think you should leave that house. I think that the guys who left didn't love your siblings enough, because if they did they will see that hes just a badly behaved man and hasten up to remove the lady from that toxic excuse of a home.
You dad is psychologically unwell and this is the reason why we say many at mad but few are roaming. So sorry about all you've been through
