Thomas Hammond (c. 1770–1820)
Bushrod Washington was a cousin of Mildred Gregory Washington, Thomas Hammond's second wife.
Thomas Hammond was born in Ireland. He sailed to Baltimore as a teenager for a six-year business apprenticeship. Hammond then moved to Charles Town (in what is now the easternmost county of West Virginia), opened a mercantile business, and served as captain of a Berkeley County militia company. In 1792 he married Mary Lewis "Polly" Tapscott.
"The Ownership of Happy Retreat by the Hammond Family, 1800–1837," The Rising Sun (Friends of Happy Retreat newsletter), May 2021, 3.
"Hammond, Thomas (ca. 1770–ca. 1826)," in Holly C. Shuman, ed., The Dolley Madison Digital Edition.
Thomas Hammond in Virginia Compiled Marriages, 1740–1850 (Ancestry.com).
Thomas Hammond at Early Colonial Settlers of Southern Maryland and Virginia's Northern Neck Counties.
CPT Thomas Hammond at Find a Grave.
Thomas Hammond at FamilySearch.