Loan agreement based on balance amount for property sale to brother

Myself and my mother, my 2 younger brothers are co-owners of a property (house) in chennai. I want to sell my share of the property to one of my brother. My brother can pay 50% of the money now and can pay balance 50% only after 3 years and he would need to register my share now itself. Can I create a separate loan agreement for the balance amount mentioning the liability of the balance amount for property registration. Also, can I mention about the loan agreement in the registration document.