tenancy rights

I have a similar query. My grandfather died 20 years back and my father has always stayed with him, before his demise and even after. My uncle was never by our side and it was my father who took care of the family. Now my father died a month back and the house is in the name of my grandfather. My uncle had also passed away 15 years back. My uncle's widow want a share now. My grandfather has not made any will. We stay in pagdi system and we are staying for more than 25 years. Are we the deemed owners ? Is my uncle's widow entitled to anything ? Please reply