Following the passing of your mother-in-law and father-in-law, your wife and her brother are the sole legal heirs to the property gifted to your mother-in-law. As she passed away intestate (without a will), your wife has an equal share in the property alongside her brother. You can resolve this amicably by executing a partition deed, which can be registered at the Sub-Registrar's office, potentially within a single day, especially with your brother-in-law's agreement.