Dadabhoy's sister, Jeevanbai, was married to Nusserwanji Ratan Tata (a distant relative).
Ratanji studied at The Cathedral & John Connon School and Elphinstone College in Bombay.
Under the name Tata & Co, Ratanji ran an opium importing business in China, which was legal at the time.
[1] In 1887, he and other merchants such as David Solomon Sassoon presented a petition on behalf of the opium traders to complain about a Hong Kong Legislative Council bill that threatened to affect their trade.
Ratanji played an important role in the completion of the project along with Jamsetji's son Dorab and thus Tata Steel was established in Jamshedpur.