"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KQ1C-2GT : 7 January 2021), Martin O'Neill in household of Mary O'Neill, Lancaster, Lancaster, Erie, New York, United States; citing enumeration district (ED) 15-122, sheet 6B, line 43, family 111, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2529.
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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 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 Thomas: