process for smooth transfer without stamp duty

My brother and myself are legal heirs to my mothers built up house. She expired without a will. The property is in her name. i wish to give my brother his consideration and He is willing to transfer his share against consideration and execute all documents. I wish for him to retain right to take it back from me upon paying back the consideration with interest. i want to do conveyance and registration of property . What are the steps to minimise stamp duty.