Henry Skipwith (1751-1815) was a soldier in the American revolution and politician. He was a lieutenant colonel in the Virginia state militia and, beginning in 1782, a member of the Virginia House of Delegates. He was Thomas Jefferson’s brother-in-law (his wife and Jefferson’s wife were half-sisters) and William Short’s maternal uncle. Short had differences with his uncle over financial matters, and Jefferson helped mediate the issue.
George G. Shackelford, Jefferson's Adoptive Son: The Life of William Short, 1759-1848 (Lexington: The University Press of Kentucky, 1993), passim.
“George W. Erving to James Madison, 29 January 1811,” Founders Online, National Archives, https://founders.archives.gov/documents/Madison/03-03-02-0169. [Original source: The Papers of James Madison, Presidential Series, vol. 3, 3 November 1810–4 November 1811, ed. J. C. A. Stagg, Jeanne Kerr Cross, and Susan Holbrook Perdue. Charlottesville: University Press of Virginia, 1996, pp. 139–141.]
Internal evidence.