Division of property

My father died in oct 2010 without leaving a will and my mother died in Feb 2011 also without leaving a will. My father kept lakhs of money aside for marriage of my two sisters and now both are married [both got married after fathers death]. Now my sisters want a money and partition in the house which is still in my father's name and my father built it. My bother and both sisters kick me out of the house ASAP. Also there was a little property of my grandfather [grandfather died in 1997 without leaving a will] which I and my brother sold in July 2015 and divided the money in half. My sisters also want a share in that. My Questions are: 1. Are my sisters legally allowed now to take a share in the house my father built? 2. Are my sisters legally allowed now to take a share in the grandfather property? 3. Can My sisters and brothers make a false will to kick me out without any share? 4. Can My brother or sister who have papers of all property get the house registered in their name ? I getting too tensed since there is lot of issues in the house. Kindly help