Father gave land to mother by Will can mother further give it to us

My father before death gave a major part of his land / house property to my mother and younger brother jointly by way of will. Other three successors agreed to this by giving consent in writing on stamp paper. Now this becomes ancestral property to my mother. Can she give her part of property as per her wish to the other remaining three successors b way of will? Can other three successors claim her part of property equally after her death or younger brother can also claim equal share? Religion - Hindu