The nature of the property that devolves by inheritance, WILL, Gift…. is self acquired.
Son/daughter may have NO forced share in self earned/acquired estate of father.
A Hindu male say; father, can dispose in his lifetime his estate/property by a valid WILL in anyone’s favor e.g; son.
He may not need anyone’s consent for doing so.
It is mandatory to probate the WILL in the areas of Bombay, Calcutta, and Madras.
It is not mandatory to probate the WILL in other areas. It is not mandatory to register the WILL.
The WILL should just be valid. Unregistered WILL can be acted upon.
The last valid WILL prevails.
Any WILL can be contested.
The best recourse is to request the father to leave some /equal share for daughter(s), amicably.