Tata Sons: the rules, the rift and what happens next

By Jayshree P Upadhyay and Arpan ChaturvediIndia's Tata Sons, the owner of marquee brands like Jaguar Land Rover and Tetley tea, is facing one of its worst boardroom disputes, with its leadership now openly split with its biggest shareholder over key decisions.Tata Trusts, the charity arm of the g…