Four of the top 20 world billionaires are members of the Bentonville-based Walmart empire.
Christy Walton, who married into the Walton family, is number 11 on the list with a net worth of $28.2 billion.
Sam's youngest son Jim Walton ranks 14th with $26.7 billion.
The founder of Crystal Bridges Museum of American Art, Alice Walton, sits at number 16. Her net worth is $26.3 billion.
And the oldest Walton son, S. Robson Walton, takes the 17th spot with a total worth of $26.1 billion.
CLICK HERE to learn more about each Walton or to see who else is named on the Forbes list of the Top 20 Billionaires for 2013.