my question is.. can he transfer or sell or even make us leave the house ?
He is the absolute owner and he has all the rights to sell the property on which he has marketable title.
and if yes than what would be ideal steps that we could take to get the house back..
You cannot retrieve the property once sold o any grounds. Your mother can file an injunction suit restraining him from selling the property until he makes an alternative arrangement for her and her unmarried daughter as she has residential rights and it is his duty to provide shelter/residence and maintain them. This way it can be ensured that the property is not being alienated.
we dont need the property n all we just need a place to stay in..
and also if his atrocities keep increasing what measures can we take ?
Your mother can file DV case seeking protection, residence rights, maintenance and any other reliefs including compensation for the mental and physical tortures meted out to her.