As per information available on the Bombay High Court website, the suit was filed on December 7 by Pramod Premchand Shah, Kalpana Shah, Vinesh Shah and Jesal Bhansali.
The content of the suit was not known.
The suit is at a 'pre-admission' stage and is not yet listed for hearing, as per the high court website.
(Reopens LGB 7)
Meanwhile, the group spokesperson of Tata Sons said in a statement late in the evening that it will "strongly" defend all its actions in the court.
"Tata Sons will strongly defend all its actions in the court of law," said the statement.