Urgent - please help !!!

So, I'm asking this being a grandchild for my Grandmother. We have a house in Lucknow which my grandfather build and is in the name of Grandfather and my grandmother. My grandfather died in 2007. I used to live in Lucknow home with my younger brother, grandmother and my uncle, his wife and their three children. In 2020, I uncle was shot in my villag and he succumbed to injuries and past away. After 6 months of his death, Aunt filed a case and implicated my father in murder case. That's the background. Now in my Village, my grandfather has given half of the house to aunt and half to us. And in the ancestral land, she has divided it into three parts, one for Aunt, one of us and one for herself. But In Lucknow, Aunt has taken control of 4 rooms in a house of Six rooms and the roof. Now we're forced to live in 2 rooms. I'm forced to pay electricity bills, and for every other miscellaneous things. She had filed a domestic case against my family but couldn't win the case. She even tried the same thing in my village but failed there also. She and her relative has stolen signed copies of my younger brothers cheque book and bounced two checks and has also send my brother legal notice, my brother was 17 years old when he filed the case. Now Apart from this this a shop in Lucknow which one the name of my father, aunt and grandmother. My grandmother lives with me because the behaviour of my aunt has been totally rude , she's abusive and has even tried to hit grandmother several times. Now I've complained multiple times in Police, but nothing has happened. I want to ask how can I get my half portion of the house provided my grandmother wants to give the other half to my aunt. I just want that we get half, i.e. 3 rooms in the house and access to the roof. Please suggest what would be the fastest way to get this done.