New Delhi, Sept. 25 -- New Delhi,

Mumbai :

If even a 66% stake can leave the largest shareholder vulnerable to a boardroom challenge at one of India's most iconic business groups, how secure is promoter control elsewhere?

Last week's Tata Sons clash has already set off such conversations among Indian business families. Family-business advisers and lawyers say the 17 September episode is prompting promoters to revisit their Trust and LLP structures, as they seek counsel over the possibility of a dispute with boards in future.

At least three family-business experts and two lawyers said the 17 September episode may lead to promoters re-examining how their controlling stakes are held and governed, with many families opting to use Trusts t...