If a MHADA property owner passes away without a will or nominee, the property typically transfers to all legal heirs. To transfer it to your mother's name, you'll likely need to obtain a legal heirship certificate from the court. Following this, a relinquishment deed will need to be registered, allowing the property to be transferred into your mother's name. It's advisable to consult the MHADA office or a local lawyer for specific procedures and any associated fees.