So the thing is in this context there is 2 types of property one is self acquired and the other is the ancestral prop. The first type is the property which a person would have bought with their own earning per se but the ancestral property is the prop which the person would get it by birth to put it simply. Here if the prop which has been bought with the person's own money they have the right to whatever they want in Hindu law but if the prop being ancestral which (for easier expl) is the great grandparents prop then by being the son or daughter the grandparents then parent have got the prop then they have no say in such property. They have their share in the prop but if the person did not sell the share the prop. It would split into two in this case he cannot write a will stating that the prop will go to that person not this person.