How to save father's property from relatives.

Respected sir/madam i am (age 57 year) from u.p. my grandfather had a plot of size 28x70 sq.feet which has been divided 38year ago between my father and younger uncle by self,both person had no objections from this property division and didnot write a division agreement on any letter.my father and uncle got 14x35 sq.foot plot separetly.my father construct a house on his plot 36 year ago by self investment but uncle didnot construct on his plot.now my father,uncle and aunty have been died .my mother still alive.till now whole of plot as mentioned above is registered on my grandfather name in nagar panchayat land record and also plot's patta is on name of grandfather. Now the matter of quarrel b/w me and my uncle's son(36 year age) is that he didnot agree by the division of property which has been done 38 year ago,he is saying that in old land record of nagar panchayat it is clearly mentioned that the whole plot(28x70)sq.f is registered on the grandfather name and no property division agreement available so divide whole property again and give him shares from my house.i informed him that i have 36 year old house record available in which my father's name mentioned and there is nothing of your shares in my father's property but he refused my arguments and her wife treating badly with me and my family members saying he send me jail with my family members by fraud case if you didn't give him shares in property,also saying that sell house to him.i suggested him go to the court and file case against me but he refused this proposal also saying matter will be solve by region muhalla panchayat because she got support muhalla panch by giving money.he is not filing case against me. Sir presently i am out of u.p for job purpose,my family also with me.i have following documents of my father's house: 1) 36 year old house tax/house no receipt.(27 year house tax is issued by Father's name and after his death last 10 year tax issuing on my name which i paying per year regularly). 2)electric/water bill on my name. 3)father's death certificate and ration card of mother's name in which all my family member's name mentioned. 4)ancestral land khasra on which grandfather name mentioned. 5)cast certificate/domicile certificate in which my Father's house no. Mentioned. Sir presently my father's house is under my pocession.please advice me what can i do for stop this quarrel and save me and my family members from his fraudent activity. Is it possible that relative forcely or by law capture shares in my father's house??