Under Hindu Law a mother, in the absence of her son's father, sells her minor son's immovable property.…

Under section 6 of the Hindu Minority and Guardianship Act, 1956 the mother is the natural guardian after the father, and section 8(2) bars a natural guardian from selling the minor's immovable property without the previous permission of the court. A sale made without that permission is voidable at the instance of the minor under section 8(3), so he can challenge it "On the ground of not taking permission from the court".

The sale is not bad merely because the mother rather than the father made it, and a sale made with the court's permission is valid.