Richest Indian Family: At one point, Jagat Seths family was the wealthiest in the world. The British economy in the 1720s, according to some sources, was not as prosperous as the Jagat Seth familys wealth. Their holdings and possessions are estimated to weigh roughly 10,000,000 pounds, according to sources. It will be close to 1000 billion pounds (1.60 Lakh Crore) overall if calculated in terms of today.