As a child, Robert Mills Grant rode his horse, Snowball, to school on the nearby CMD Ranch on Richeau Creek. He later attended a school constructed on the Grant Ranch but completed high school in 1944 in Wheatland. With his parents, he ran a cow/calf operation on the then third-generation ranch. Established in 1884, the Grant Ranch is among the oldest continuous grazing operations in Wyoming. In 1976, Grant lost his first race for a seat in the state House of Representatives to
Democrat Douglas K. Bryant of Wheatland but was elected in 1982. He served five two-year terms in the House and bowed out in 1992 when Platte County was reduced to a single seat in the lower legislative chamber. Particularly known for issues related to
livestock branding, Grant was chairman of the House Brand and Theft Committee and once declared, "Brand law in Wyoming is the best in the West." ==Death and legacy==