1. The elder sister can execute a Release Deed relinquishing her rights over the property in favour of her younger sister, thereby the younger sister would become the Absolute Owner of the property or
2. The elder sister can gift her share of the property to her younger sister by executing a Gift Deed in her favour. The transfer of property to younger sister takes immediate effect, when once the younger sister accepts the gift during the lifetime of elder sister itself or
3. The elder sister can execute a 'WILL' bequeathing her share of the property to her younger sister, here the transfer of property to the younger sister takes effect after the demise of the elder sister.
4. A notarised letter claiming "NO RIGHTS" does not transfer the property to the younger sister..