After marrying , Duncan took over ranch operations and was eventually joined by son Robert Grant III .
After 1900 Margaret and Robert retired to Wheatland , and the ranch was taken over by their daughter Clara and son Duncan , both born after the move to Wyoming .
After marrying , son took over ranch operations and was eventually joined by son Robert     .
After 1900 Margaret and Robert retired to Wheatland , and the ranch was taken over by their daughter Clara and son Duncan , both born after the move to Wyoming .