Pagdi system house that is vacant since 10-12 years

We have a pagdi system house that is lying vacant since 10-12 years. Our family from generation of grand father used to stay there, but later due to old age of my parents, we could not stay there (frequent roof leakage plus common toilet). since the time we moved out, the landlord has stopped taking rent from us. (there are 3-4 families like us who have left the place and landlord is not taking rent from them as well). The house is very old bought by my Grandfather, there is no documentation related to pagdi tenancy agreement with us. Only old rent receipts in the name of my father is available with us. Both my parents have passed away. Electricity bill of that house is even now paid by me. Almost every year roof repair due to rains is also done by me. I want to know whether i have any rights towards the property in absence of any proper documentation. I am willing to sell the property to landlord. how do i approach him? Earlier i had tried to meet him but he was not keen to discuss it. We cannot keep incurring repair expenses of that house.