Hugh Grosvenor, 7th Duke of Westminster – $13 million
The young Hugh Grosvenor was one of the wealthiest young men in the world when he was born. He was also the heir apparent to the throne of England as the seventh Duke of Westminster. His main source of income was from the Grosvenor Group, which he obtained in various ways. In the United Kingdom, he was a real estate company manager. In addition, he worked as the payable and receivable manager for Bio-accounts bean.

Hugh Grosvenor, 7th Duke of Westminster – $13 million