Marijke Mars is a fourth generation member of the Mars family. Her father was the late Forrest Mars Jr. (1931–2016). She has three sisters: Pamela Mars-Wright, Valerie Mars and Victoria B. Mars. She inherited an about 8 percent stake of Mars Inc. in 2016, which made her a billionaire. According to Forbes, her shares were valued at $5.9 billion (March 2018).