Younger Ambani sibling orchestrated the merger of his Reliance Communications' telecom business with that of rival Aircel, controlled by asMalaysian billionaire Ananda Krishnan, to form what will be the country's fourth-largest mobile phone operator once the merger, which requires regulatory approvals, is completed. He's also betting on the defense sector with a new joint venture between his Reliance Defence and Israel's Rafael Advanced Defense Systems to manufacture air-to-air missiles. Son Anmol, who works at Reliance Capital, was appointed to that company's board in August.