Domestic violence

Well, first give a formal complaint to jurisdiction police station ASAP stating facts against dear dad.

Of the other things your mom can do is,

File for divorce based on adultery (keep proofs ready for his adultery).

File 125 crpc application asking alimony for you all, if kids aer lesser than 18 years of age, then you all can get alimony from your dad.

Ask rent under PWDVA 2005 drom your dad.

If your dad has earned his property on his own, then he can give it to anyone whom he wishes.

Its too early to think about property etc.  It appears that you have other plans than he trying to kill your mom.  Why do you want to think about property and share when nothing has happnd?

Contact local lawyer and meet in person to strategize your next move.

Only your mother can file a case against your father.  Rest all issues are irrelevant at this stage.

Ask your mother file sec 125 criminal complaint before any jurisdictional magistrate, that she culd by herself under a private complaint process or a local magistrate court advocate, she would be entitled to about 50% of her husband's income as she has children out of the wedlock. do not fie divorce suits, for that might be counter productive.