Ancestral property

Almont 25 years ago my father had came out from his house(ancestral) with the real file of the 60cr+ property stating that my grandfather is giving each of his son 50 % of his property . His elder brother made a fake file in the signature of my grandmother stating that she is giving all of the property in the name of her elder son , my father's elder brother. In 2013 my father's elder brother made almost 2-3 variety of fake case to prevent my father to grab his own property portion----My father is going from time to time and beats his family member for his property etc etc... for this he had been jailed for 4 months in 2013 and all of this cases are still going on. My father now aged 60+ and still hardworking daily , almost 4000-5000 he has to submit in court every month, he gets 8000 salary every month. Now my questions is what attempts I have to take to prevent or stop this case and is there is a chance to get his own property portion still now ?? Note: My father's elder brother passed away in 2020.