Property Will overwritten by manipulation

After my grandfather's demise, the house which we are residing in was decided to be partitioned and my grandmother registered a document in which it stated that my mother (one among three children) holds 50% rights on the house and the other 50% for my grandmother. For the 50% that my mother holds, my mother gave her brother their share by calculating the rate of the house, during the time of partition. My grandmother also wrote a will stating that after her demise, my mother who is taking care of her since grandfather's death will hold complete rights over the property. But recently, one of my mother's brothers took my grandmother to his place and took control over all her finances. He took away her FDs and also the will, and manipulated grandmother to write another will which stated that all her children will hold equal shares over the property(house) and that the FD and the jewelery that she holds will be for the brothers. Can we take any legal action against this ?