Wal-Mart Heirs Again Top Forbes List of 25 Richest U.S. Families Posted by June 30, 2016 Leave a comment on Wal-Mart Heirs Again Top Forbes List of 25 Richest U.S. Families Collectively, the top 25 wealthiest families in America are worth $722 billion, down 1.5 percent, or $11 billion, from a year ago.