“Memorial of the Thayer name, from the Massachusetts colony of Weymouth and Braintree, embracing genealogical [!] and biographical sketches of Richard & Thomas Thayer, and their descendants from 1636 to 1874, by Gen’l Bezaleel Thayer, (1874) p. 401 [1]
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8KN-8KS : 12 April 2016), Thadeus S Thayer, New York, United States; citing p. 83, family 644, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,596.
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DNA Connections
It may be possible to confirm family relationships with Thaddeus by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Thaddeus: