Jim Walton, Arkansas
Walton's $51.6 billion net worth comes from Walmart. He's the youngest son of the superstore's founder, Sam Walton. He runs his family's Arvest Bank, which is worth more than $16 billion. He was on Walmart's board for more than a decade before giving his seat to his son.
Ernest Garcia II, Arizona
Garcia made his $5.6 billion fortune in the used car industry. He's the biggest shareholder of Carvana, the online buying and selling platform. It was founded by his son, Ernest Garcia III. It's a subsidiary of DriveTime Automotive, which the elder Garcia founded.