Need help for ownership transfer

Hi i 22M need help Or information about the ownership transfer of the Chawl house in Kandivali. Last year I lost my father due to illness and the room was on his name. There are no wills or anything of that sort to claim succession. Recently there have been SRA survey going in my area and they need the owner to be present or the survey would not proceed. So I would like to transfer room on my mother name legally and I talked with lawyer but 1 said it will take 8k and it will take 75k with court charges for some succession certificate I don't have that big amount of money saved. So if any one know the process and approximate charges that will be liable please guide me.