[1] Upon the 1 July 1999 death of Forrest Mars Sr., he and his two sons were ranked No.
29, 30, and 31 by Forbes magazine's list of richest Americans, and they each had a worth of approximately $4 billion.
In March 2010 the three children of Forrest Mars were tied for 52nd place amongst the world's richest people, according to Forbes, with a net worth of US$11 billion each.
[2][3][4] One of these sons, Forrest Mars Jr., died on 26 July 2016, and his four daughters inherited his wealth, with three of them working for the company as of 2019.
[7] A 2006 report quantified how the Mars family was among 18 billionaire families, starting in the 1990s, who continuously lobbied Congress to eliminate the estate tax.