Nancy’s brother, John married David’s sister, Mary.
↑ "Virginia Marriages, 1785-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XRW9-R99 : 11 February 2018), David Beatie and Nancy Clark, 09 Nov 1809; citing Washington Co., Virginia, reference Page 20; FHL microfilm 34,389.
Find A Grave, database and images (https://www.findagrave.com : accessed 06 July 2018), memorial page for Nancy Clark Beattie (19 Feb 1787–unknown), Find A Grave: Memorial #61594212, citing Hobson Cemetery, Andrew County, Missouri, USA ; Maintained by Eric Thompson (contributor 47283012) .
It may be possible to confirm family relationships with Nancy by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Nancy: