Sale of property by heirs through POA, objection raised by one heir

We have a property in India which was bought by my grandfather and his two brothers, all three now deceased. There is a property document/will which mentions the heirs of the said property. We would like to sell this property, where all heirs have agreed to assign the power of attorney to one, who will come to India and sell it. But there is an objection by one heir to sell this property and he is the minority share holders. How can we sell the property if he is against it? Or can the rest sell their part of the property?