Transfer under construction property in blood relationship

Hi,

I have puchased a property in name of my mother nad sister, the payment is made by me most of time by cheque, it was self funded property.

Now i am looking for transfer/name change into my name.

Can anybody advcie how does it take place, the builder fist said it would be a name change for which I have created the document.

later he said this is a transfer case, so i prepared document for that too also.

Now he is saying you need to pay x% fee as Admin/Transfer fee on it.

Can you please advvice is there any cost with blood relationship transfer of property(under construction).

Thanks,

Jitendra