You have to get under Hindu Minority and Guardianship Act, sale of such property cannot be done without prior permission of the court.
"As per clause (a) of subsection (2) of Section 8 no immovable property of the minor can be mortgaged or charged or transferred by sale, gift, exchange or otherwise without the previous permission of the court,"
Therefore, the requirement under Section 29 of Guardians and Wards Act, 1860 is only to obtain a permission from the Court to sell the property of minors, for the person who has been appointed or declared as guardian of the property of the minor