On 1 July 1799 he purchased from John Tayloe III a slave named Jenny for 5 Shillings.
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/83988020/william-augustine-washington: accessed 03 April 2023), memorial page for Capt William Augustine Washington (25 Nov 1757–2 Oct 1810), Find a Grave Memorial ID 83988020, citing Mount Vernon Estate, Mount Vernon, Fairfax County, Virginia, USA; Maintained by Cameron Disney Darby (contributor 47173342).
Geni World Family Tree Publication: www.Geni.com. Geni is owned and operated by MyHeritage. Collection Media: 40000 https://www.myheritage.com/research/record-40000-24677083/william-augustine-washington-sr-in-geni-world-family-tree Certainty: 4 William Augustine Washington, Sr.Gender: MaleBirth: Nov 25 1757 - Wakefield, Westmoreland, VAMarriage: Spouse: Sarah Washington (born Tayloe) - May 11 1799 - Haywood, VirginiaDeath: Oct 2 1810 - Georgetown, Washington, DCBurial: 1810 - Fairfax Co., VaFather: <a>Augustine Washington, Jr.</a>Mother: <a>Anne Washington (born Aylett)</a>Wives: <a>Jane (Jenny) Washington</a>, <a>Mary Washington (born Lee)</a>, <a>Sarah Washington (born Tayloe)</a>Children: <a>Anne Aylett Robinson (born Washington)</a>, <a>Corbin Aylett Washington</a>, <a>Hannah Bushrod Washington</a>, <a>Laurence Washington</a>, <a>Augustine Washington</a>, <a>Bushrod Washington</a>, <a>George Corbin Washington</a>, <a>Sarah Tayloe Washington</a>, <a>Infant Washington</a>, <a>William Augustine Washington, Jr.</a>Siblings: <a>Lawrence Washington</a>, <a>Augustine Washington, III</a>, <a>Elizabeth Spotswood (born Washington)</a>, <a>Ann Ashton (born Washington)</a>, <a>Jane Augusta Thornton (born Washington)</a>, <a>George Washington</a>
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Samuel Washington :
Y-Chromosome Test 17 markers, haplogroup R-BY32422, MitoYDNA ID Z12300[compare]