How to make will of daughter rights on coparcenary property

My grandmother was came to his brother place just because all of his wife death,he married thrice.he request to my grandmother for raising her own children and his children also and given one plot to stay.after few years of her death my father moved Mumbai for some medical reason of my brother.Mr.sukhdev ray(grandmother brother) his elder son(Rajinder Ray)collapsed the house constructed by my grandmother without informing my father and make 3 rooms stable type. The younger son asked us for money that spent to construct i.e 70000 we have given to him and he ready to move his animal from there but now he is not ready to move his Buffalo from front of the door and if protest he come to kill my family just few days back one of elder son(mahinder ray) beat my mother with two punch on her breast they were saying that my father died so nothing for you go take your rights from my father grave(Mr.sukhdev ray) Now Mr.Rajinder ray calling us and demanding for money that spent on construction for house(Actual expenses70000 which was already taken by Joginder ray).I checked the deed details of plot which is on the name of Mr.kunji ray(my grandmother and sukhdev ray father) so please help me how can I claim my grandmother rights legally and show the law power to that gunda(joginder ray)because it is coparcenary property and there is equal right for brother and sister.( Mr. Kunji ray, Sukhdev ray, Sati dev(grandmother) all died. (Mr.mahinder ray,rajinder ray,joginder ray- 3 sons of sukhdev ray) giving this trouble to us from last 8 years.