Gift deed share of property to brother.

We, two brothers and one sister, have ancestral property in Delhi. After my father's death , in the absence of any will, with mutual understanding mutation of the property was done in favour of our eldest brother, and registered in the office of registrar of our area in new Delhi. Now we wish to demolish old structure and construct two floors above the parking area, with equal share in the property. My query is: 1. Can my brother make a registered gift deed in my favour before the actual construction starts. 2. What are the other remedies for the sharing equally between we two brothers. 3. Our sister has no interest in the property.