Purchase of a land

I seek you experts to provide suitable guidance on the below case. A couple is blessed with two girl babies. The wife was purchasing land properties in her name and died without making the property settlement. later the Husband had died after writing a registered will quoting the detail of the properties to both of his daughters. Upon the will, the daughters got recordered their names seperately into the revenue records. later consent deed was granted by the elder sister to the younger one vice versa. Both the above Legal Heir of the couple crossed 50 years old and started selling their properties now. while purchasing of the land, both the legal heirs are signing in buyer sale deed. In such case and in future, those sellers children (Grand children) will raise dispute that those propeties were purchased by their grand mother and without their knowledge those land property sold etc..? Please guide on shall we purchase the land? Is there any legal way for the grand children to raise the dispute in future? I need your kind opinion as the partition was not made between the legal heirs and upon the Will by father (1/3rd share), consent deed between the legal heir, started selling the land.