1. "Irrevocable" POA for Sale /Gift /Transfer /Mortgage /whatever, specifically for "immovable property" must be stamp duty paid (500/-) and duly registered (1000/-), before the local office of Registrar of Sub-Assurances, anywhere in India.
2. The above is compulsory, irrespective of any blood relation /whosoever.
Keep Smiling .... Hemant Agarwal