Sprawling clan behind the storied 77-year-old Amalgamations Group, chaired by late founder's son A. Krishnamoorthy, saw its wealth rise despite a tepid market for tractors, the group's biggest business. Its privately held Tractors & Farm Equipment (TAFE ), India's second-largest tractormaker, has a joint venture with U.S.-based AGCO and is run by Wharton-educated Mallika Srinivasan, a member of the third generation, who also sits on AGCO 's board. Srinivasan disputes our net worth estimate.