Can ancestral property be sold by a person's (after his death) sons and daughters without consent of grand daughters who are major? Particularly when the sale/alienation is detrimental to the interest of Major grand daughter.
Grandchildren are not class 1 legal heirs. Once there was a partition among the father and his brothers by metes and bounds, then after the death of the father, children are entitled for a share. Contact a local advocate with such facts and he will be in a better position to offer further guidance practically.