Property Transfer Fees

I am a student and I want a collateral loan my grad fathers property.

My grand father is no more but he has already done a registered will in name of my mother, my real brother, my aunt and my cousin brother.

We also have a deed certificate for the same.

I wanted to ask that do we need to pay fees to get that property transferred to my mother and my brothers name so that I can get a loan or can banks use registered will to sanction the loan on that behalf.