Property ownership

Description Hi, I stay in a flat from 16 years. This flat is in my aunt's and grandmother name. Grandmother has 2 daughters and 4 sons. Total 6 children of my grandmother.Two of son's expired. I am grandson whose father is expired. Aunt whose name is in property has done second marriage because other son is also expired. As I(grandson)am staying in this flat from 16 years , do I(grandson) have a legal right on this property? My father expired before my grandmother.2 daughters of my grandmother i.e. my aunt's are alive(over 50 years old,married,have their married childrens). Aunt's after 40 years of marriage are now claiming on this property. In last 15 years ,I have done all maintenance and repair work. Paid all bills and staying there. Could you please let me know if I can claim full ownership on this property? If I cannot claim full ownership, can I continue to stay in this flat even if they try push me out. I am only person living in flat. Doing all maintenance from 15 years. They are already harrasing me and forcing me. Can we file a criminal case and continue to stay in this flat? Can they sell this flat without me as my name is not in this property. Can they force me sell?