The Grants emigrated to the United States in 1878 with their sons Tom and Robert, Jr. to join some of Margaret's family members in Wyoming.

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, Duncan took over ranch operations and was eventually joined by son Robert Grant III.

Later additions included a bunkhouse/schoolhouse (c. 1917), a brooder house (c. 1930), a coal shed (moved to the ranch c. 1920) and a playhouse from another site.

The walls are thick local limestone covered with lime and sand stucco.