They've had an odd pseudo nepotistic passing-on-the-torch framework for 100+ years now. The Tatas adopt promising children in the extended family, instead of passing ownership by birth order. Ratan Tata's father was adopted into the extended family, and Ratan later got adopted by the main line of the family to be groomed into heir apparent. Keeping up with the tradition, Ratan never married or had his own children.
Cyrus Mistry, the head of another billionaire family, became one with the Tatas through marriage & mergers. Cyrus was groomed to be the next heir apparent. Unfortunately, he met an untimely death from a car accident in 2022.
2022 marked move away from the century long tradition of keeping it in the family. The new CEO is a self-made man with no relations to the family or the Tatas' shared religion (Parsi). Usually this merit based system would be cause for celebration, but the Tatas hold a paragon-esque reputation among well-run old-money family-owned institutions.
It'll be interesting to see if the company loses it's heart as it slowly morphs into a faceless conglomerate.
RIP to Ratan.