1. The property was transferred to two daughter alone by executing a testamentary disposition by the testator.
It is an accepted fact that the testator had a clear and marketable title hence the transfer or the bequest made by him in favor of only two daughter s has been held to be valid by all the courts including the apex court.
There is no question of proving before the court taht this is ancestral proeprty at this stage when this was not fought on that grounds before anby court in the past.
Hence this step now proposed to be taken is nothing but to fill up the lacuna which is not acceptable in law.
The property might have devolved in the heirs for generations, but it is to be seen that if the property was partitioned among the legal heirs prior to your father's inheritance among his father or grandfather and his siblings, the porperty loses its ancestral character since the continuity chain to establish the ancestral nature is broken, therefore this property cannot be considered as ancestral property.
You may discuss with your advocate at length on such issues before jumping into any decision or conclusion.
2. If it was inherited from is father as his share then it may not be considered as ancestral property.
3. In fact if it was ancestral property then the daughters cannot claim any share in it as a right because as per the amendments in the year HSA, the daughters have equal rights as a coparcener but that will be effective from the date of such amendment and the father should have been alive on or after that date for the daughter to claim her share in the property as a right.
Therefore claim for rights in the property on the basis of ancestral property is not maintainable as per the latest amendment in the year 2005.
4. If the will was not challenged by the party opposing the it, then it is not mandatory to get the will probated by a court competent.