Tata Trusts has declared N Chandrasekaran's reappointment as Tata Sons chairman illegal. The Trusts argue the board resolution is a legal nullity due to Noel Tata's opposition. This dispute arises after the RBI rejected Tata Sons' bid to surrender its core investment company status. The Tata Sons board also agreed to proceed with the company's stock market listing. The succession process now faces significant uncertainty and potential legal challenges.