Person A has 7 sons and one daughter. Person A who belongs to SC community got 5 acres land granted from government of Karnataka in 1977. Person A expired in 2000. In 2011, all 7 sons and 1 daughter decided together and got pavathi khata in the name of elder son of A. Later in the same year, elder son of A sold 5 acre land to another person B from SC community taking permission from all sons, wife and daughter of A. Now can I buy land from B? While selling elder son of A has not taken permission from government. How to purchase this land?