The three surviving children of Walmart founder Sam Walton have a collective net worth of $340 billion, more than either Jeff Bezos or Mark Zuckerberg.

The Waltons, one of the world’s wealthiest families, said Thursday that internal governance of their ownership interest in Walmart Inc. will expand to include its next generation.

The Walton family, which own a major stake of Walmart’s stock, and are offspring of founder Sam Walton, have expanded voting rights to younger members of their family. Previously, the voting members were Rob Walton,

The wealthiest family in the U.S. is shaking things up in terms of who has voting rights with Walmart (NYSE:WMT). While the leadership and board roles held by members of the Walton family are unchanged,