As you stated that your grand father purchased the property, the same amounts to self-acquired. Thereafter prior to death he having executed a Will in favour of your father and uncle appointing them to be as beneficiary, they both were and are entitled to the property. The relinquishment deed executed by your Uncle in favour of your father has made your father the owner in complete to the right, share and interest in the property. Before Mutating, check out if the will-deed executed by your grand father was or is challenged by any of the brothers and sisters of your father, if not, you have to prefer application along with the copy of Sale-deed, Will-deed and Relinquishment Deed before the authorities. Theres nothing left as in the property once is mutated in the name of your father, you can get the tax leived in your fathers name with the Mucipal authorities and as matter of abundant precuation publish in news paper by way of pubvlication that your father is owner of the property to avoid any objections.