1. After the gift deed is complete the gift deed cannot be unilaterally revoked.
2. To revoke the gift deed your father has to go to court and seek the cancellation of the deed. There is no other legal recourse available to him.
3. No other legal heir can claim a share in the property which has been gifted to you. You are the owner of the property now.
4. Your father cannot make a will now as he has gifted the property to you.