Share of property

I am staying in my house which is jointly held by my father and me with 50% share each. Now my father has passed away and my mother and sister are asking for equal share in the property i.e. 33% each. Legally I should also get my share in my daddy's share but my mother and sister are wanting equal. I have a wife and 2 children and sole earner and my mother stays with me. Sister is married in a far off state. My mother has started harassing us on different occasions with petty things like keeping the gas burner on and going away, using the washing machine to wash just one single cloth at a time, talking loudly in her room on the phone, large mobile music and all. She along with her daughter has started using these techniques to harass us so that we give equal share and go away. The property is in dispute since my fathers death. Also just heard that my sister is going to walk in to this house with her family to stay with my mother. She and her husband have a hoodlike nature and I am scared for my wife and kids. I am suffering from a disease which has left my lower body nonfunctional. How do I get rid of this nuisance once and for all and how do I stop my sister from entering. Can I restrict her straightaway? Her and my mothers name is not in the property yet. They will sign the agreement only if they get 33% each. What can I do to safeguard my family and also clear the house title. I am ready to take my part and move out from here but then they wont let me do that.