The twin nephews of Bajaj Auto's Chairman Rahul Bajaj, Anurang Jain and Tarang Jain, have both become billionaires with a net worth of $1.1 billion each. Anurang Jain's fortune soared 74% since his company Endurance Technologies' October IPO, while Tarang's fortune is based on the valuation of closely held Varroc Group. Both companies count Bajaj Auto as their biggest customer.