His grandfather , Robert Gamble Cabell was a physician ; his father , Robert Gamble Cabell II ( 1847-1922 ) , had an MD , but practiced as a druggist ; his mother , Anne Harris ( 1859-1915 ) , was the daughter of Lt. Col. James R. Branch , of the Army of the Confederate States of America .
His father , Robert Gamble Cabell II ( 1847-1922 ) , was a physician .