The Walton Family also reaps the benefits from other Walmart-owned companies, such as the warehouse chain Sam's Club and the British supermarket chain Asda. Walmart, as the no. 1 Fortune 500 company, has become a lot larger than its late founder Sam Walton first envisioned.
While getting his degree in economics at the University of Missouri at Columbia in the 1930s, Walton waited tables, delivered newspapers and clerked at a five-and-dime.
He opened the first Walmart store in Arkansas in 1962 and built his retail business on the premise that Walmart should service rural areas and "help customers, cut costs and share profits."
His company grew rapidly and went public in 1970. Sales associates who had remained with the company and received Walmart shares saw their own wealth grow, CNBC anchor David Faber reports in the documentary "The Age of Walmart."
Walton and his wife Helen raised four children, Rob, John, Jim, and Alice. In 1992, President George H. W. Bush awarded Walton the Presidential Medal of Freedom. The Walmart founder passed away the same year. By then, his family was already the richest in the nation, and his New York Times obituary called him "the most successful merchant of his time."
His son John died in a plane crash in 2005 and Helen died in 2007. The surviving three children own about 50 percent of Walmart's stock.
"My parents didn't believe value and worth had anything to do with money. I think it's always been important to keep your feet on the ground and your nose out of the air," Alice Walton told CBS News.
Though her wealth helped increase the family's bottom line, the billionaire still holds tight to one of her father's frugal habits: driving an old, cheap car. Sam Walton drove around the 1979 version of the same truck until he died over a decade later, and other members of the Sunday Times Rich List, including Bezos, Buffett and Mark Zuckerberg, also have a habit of driving old cars.