Both families are pillars of the Parsi community, comprised of descendants of Persians who first landed in India in the ninth century.
Noel was one of the contenders for the top position in 2011, but the succession panel led by Ratan Tata picked Mistry as chairman.
The unions are opposed to the company's proposals regarding the pension scheme and future capital investment
Tata Group currently commands a listed market capitalisation of over $125 billion (close to Rs 8.5 lakh crore)
He reiterated that he had assumed the role of the Interim Chairman for stability and continuity so that there is no vacuum.
Media sources said that Ratan Tata and Tata Sons were not informed about major business decisions
Mistry had in a letter to the board earlier this week said he was made a lame duck chairman
Mistry alleged that a 'realistic assessment' of the group's portfolio would require $18 billion in writedowns
Industry Analysts expect Vistara & AirAsia India, both part-owned by Tata, to enjoy fresh cash and expansion plans
As the slugfest between the Tata Group and ousted chairman Cyrus Mistry gets uglier with Tata Sons accusing the latter of making "unsubstantiated claims and malicious allegations" against the Indian conglomerate, here's a recap of events that you may have missed
There is muted exuberance among thousands of TCS employees, too
A report in the Economic Times said that Mistry in the letter criticised the decision and termed it as 'unparalleled in the annals of corporate history.'
Both the decisions occurred within a year of Cyrus Mistry taking over as group chairperson but now as Mistry's email to Tata Sons board members indicates he might have had little role in them.
Ratan Tata had great hopes for his hospitality business but the hotel chain hasn't been expanding as was originally envisaged
Soon after Mistry's ouster on Monday, Tata got in touch with the PMO and even sent Modi a letter, briefing him on the development
The day after Tata Sons removed Cyrus P. Mistry as the group's chairman, the issue appeared headed to the courts for what may likely be a messy legal battle.
Tatas will have to answer a lot of questions the days to come. This also includes questions from important government institutions such as LIC which are significant shareholders
The decision announced last week to open up aviation in India will make it easier for start-ups to fly overseas sooner
Most recently it was adjudged a close runner up in the ticketing bid for the Rio 2016 Olympics
It was founded in April 2015 by IIT-Kharagpur alumni