Daughters of the American Revolution, DAR Genealogical Research Databases, database online, (http://www.dar.org/ : accessed 2020-12-14), "Record of Thomas Barrett", Ancestor # A006717.
Find a Grave, database and images (https://www.findagrave.com : accessed 14 December 2020), memorial page for Thomas Barrett Sr. (2 Oct 1707–20 Jun 1779), Find A Grave: Memorial #39958871, citing Old Hill Burying Ground, Concord, Middlesex County, Massachusetts, USA ; Maintained by Kristin Jones (contributor 47028934) .
Middlesex County, MA: Probate File Papers, 1648-1871.Online database. AmericanAncestors.org. New England Historic Genealogical Society, 2014. (From records supplied by the Massachusetts Supreme Judicial Court Archives. Digitized images provided by FamilySearch.org); case 1273
p. 416, Death of "Deacon Thomas Barrett, age 72 June 20, 1779"
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DNA Connections
It may be possible to confirm family relationships with Thomas by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Thomas: