Who are the Hindujas, billionaires sentenced to jail for exploitation?

Indian-born billionaire Prakash Hinduja, his wife, son and daughter-in-law have been jailed for 4-4.5 years by a Swiss court for "illegally exploiting poorly-paid servants" at their villa. Prakash's father, Parmanand Deepchand Hinduja, began a trading business in 1914 in British India's Sindh region, which later moved to Mumbai and then to Iran. The family is worth at least $14 billion.