George Augustine Washington (c.1759–1793)
George Augustine Washington was a cousin of Bushrod Washington.
George Augustine Washington was the oldest son of George Washington's younger brother Charles. His two stints in the Revolutionary War included service as a guard for his uncle and as an aide to Major General Lafayette. Plagued by poor health—likely tuberculosis—George Augustine left the military in 1782 to seek a cure in the West Indies.
"From George Washington to George Augustine Washington, 21 November 1778," Founders Online, National Archives, https://founders.archives.gov/documents/Washington/03-18-02-0263. [Original source: The Papers of George Washington, Revolutionary War Series, vol. 18, 1 November 1778 – 14 January 1779, ed. Edward G. Lengel. Charlottesville: University of Virginia Press, 2008, pp. 252–253.]
"To George Washington from Samuel Vaughan, 4 November 1788," Founders Online, National Archives, https://founders.archives.gov/documents/Washington/05-01-02-0071. [Original source: The Papers of George Washington, Presidential Series, vol. 1, 24 September 1788 – 31 March 1789, ed. Dorothy Twohig. Charlottesville: University Press of Virginia, 1987, pp. 91–93.]
Samuel K. Fore, "George Augustine Washington (ca. 1759–1793)," Digital Encyclopedia of George Washington (George Washington's Mount Vernon).
George Augustine Washington at Find a Grave.
MAJ George Augustine Washington at FamilySearch.