Latest Answer: Hi,
If your mother, sister and brother is alive then it is very necessary to register a Relinquishment Deed in your favor from your mother and sister at the concerned registrar. Because after the death of your father you, your mother and your sister all have inherited 1/3rd undivided equal share in the whole property of your father and they can released their share in favour of you by the virtue of Relinquishment Deed and after that you will be the owner of the whole property.