My grandfather expired last year and left us with a property in our hometown in Tamil nadu. This is a ancestral property that my grandfather inherited from his grandfather. My father has two sisters and so all the three of them are the legal heirs. We recently got the no objection certificate signed by the two sisters. While we are trying to sell the property, I am told that apart from a no objection, a power of attorney to this effect has to obtained from my fathers sisters and the same needs to registered in a registrar office closest. Is this true or a no objection certificate will suffice ? all your valued advises are sought here.