Grandparents property

Hello my grandfather had a property and he died without a will he has three children my father and two of my aunts. Now my father has an unfit mind and has never fulfilled his responsibilities and aunts do not want to claim any right. We sold the property and the new house that we bought was in my mom's name. We are two brothers both of us are married my mom is bent towards my brother and threatens us, telling us to leave the house. I have been there for them since I was 17 and earned aswell. They want to divide the property into 3parts and I know my parents part would ultimately go to my younger brother he had played mind games here. Do I have no legal right here. Does the government has no law to protect mine and my wife's right she also came through an arranged marriage setup?is this really fare? I want my parents to divide it into half and I agree that they should have a right on both the properties with a will in the name of both of us equally. Can u suggest something that can protect my right. I have given up my life on them.a d want an equal share not 1/3 of it.