Transfering tenancy to daughter

My parents stay in an house which come under the pagadi system. It is my moms house where she was born. She is staying there down last 70 years. My father shifted there after my parents got married as my mom is the only child of her parents. I am also the only child of my parents.i am married. I am staying with my husband in his house which is owned by my mother in law. As my parents are old, I stay with them on the week ends and keep on visiting them during the week days regularly. As it is my mother's parental house, the rent receipt is in the name of my maternal grand mother who passed away 20 years back. My mother wants the rent receipt to be made in my name to avoid future property issues which may arise after her as i am a married daughter and the rental property cannot be transferred by will. My aadhar card, pan card and bank ststements have my mother's address as correspondence. The landlord is against this transfer and insists on transferring in my mother's name and not mine. He is also asking 2lac for tranfering the receipt in the new name without any legal papers in writing. What stand should I take?