George Marshall was the youngest of three siblings. His older brother Stuart Bradford Marshall (1875–1956) was a graduate of the Virginia Military Institute, and became a manager and executive in several metal production corporations, including the American Manganese Manufacturing Company. He later worked as a metallurgist and consulting engineer specializing in the production and operation of blast furnaces, coke ovens, and foundries. George and Stuart Marshall were long estranged. George Marshall married Lily Coles, who a few years before had rejected the proposal made by Stuart Marshall. When Stuart found out George was engaged to Lily, Stuart made unkind remarks about her, and George "cut him off my list". His sister, Marie Louise (1876–1962) was the wife of Dr. John Johnson Singer, an Army physician who died in 1934.