Family dispute, I want to ask if any legal action I can take

The situation is: my father was born to someone else but he was living with his mama and mami since he was around 15, because his real parents were dead. My father is now dead, but he has all the documents like adhaar card, passport, death certificate, bank accounts, lic policies, ration card, etc where his mama name is as his father’s name. He died at the age of 47, but because of some disputes Between my mother and dadi (father’s mami) we left the home when my father was around 42, means 5