Samuel Washington (c. 1770–1831)
Samuel Washington and Bushrod Washington were cousins.
Samuel Washington, youngest son of Charles Washington (1738–1799) and nephew of George Washington, was born circa 1770 in Stafford County, Virginia. A planter who resided near Charles Town, Berkeley County, Samuel served as a militia captain in the suppression of the Whiskey Rebellion. The following year he married Dorothea Thornton (1778–1813). Poor crop yields and responsibility for his ailing father's debts resulted in appeals to his uncle for financial assistance.
Justin Glenn, The Washingtons, A Family History: Volume 1, Seven Generations of the Presidential Branch (El Dorado Hills, CA: Savas Publishing, 2014).
"[Diary entry: 12 September 1797]," Founders Online, National Archives, https://founders.archives.gov/documents/Washington/01-06-02-0006-0009-0…. [Original source: The Diaries of George Washington, vol. 6, 1 January 1790 – 13 December 1799, ed. Donald Jackson and Dorothy Twohig. Charlottesville: University Press of Virginia, 1979, pp. 256–257.]
"From George Washington to Samuel Washington, 12 July 1797," Founders Online, National Archives, https://founders.archives.gov/documents/Washington/06-01-02-0209. [Original source: The Papers of George Washington, Retirement Series, vol. 1, 4 March 1797 – 30 December 1797, ed. W. W. Abbot. Charlottesville: University Press of Virginia, 1998, pp. 247–249.]
Ron Chernow, Washington: A Life (New York: The Penguin Press, 2010), 779.
Martinsburg Gazette (WV), 8 September 1831, page 3, column 3 (Newspapers.com).
CPT Samuel Thornton Washington at Find a Grave.
CAPT Samuel Thornton Washington at FamilySearch.