Answer
Ratan Tata is the adoptive grandson of Ratanji Tata. Ratanji Tata was the founder of the Tata Group, which is a large Indian multinational conglomerate. The Tata Group is one of the largest companies in India and has interests in a wide variety of industries, including automobiles, steel, and telecommunications. Ratan Tata was the chairman of the Tata Group from 1991 to 2012.