"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q29G-MSLB : 10 November 2020), Abigail Adams in entry for Abigail Adams, 1847; citing Death, Massachusetts, United States, Massachusetts Secretary of the Commonwealth, Boston; FHL microfilm 007009211.
Genealogical and Family History of the State of connecticut: A Record of the Achievements of Her People...
Lewis Historical Publishing Company (original from Cornell University)
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It may be possible to confirm family relationships with Abigail 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 some percentage of DNA with Abigail: