John and his siblings Jacqueline and Forrest Jr. (died July 2016) inherited stakes in the candy firm Mars when their father died in 1999. He and Jacqueline each own an estimated one-third of the company. His late brother Forrest Jr.’s four daughters own the rest. The $40 billion (sales) candy, petcare and food company was founded by John’s grandfather, Frank, in 1911. Mars is also a big name in pet care, with brands including Pedigree and Whiskas, as well as food like Ben’s Original rice.