"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQSP-ZVH : accessed 1 July 2018), Frederick Blair, Assembly District 16, Manhattan, New York City, New York, New York, United States; citing enumeration district (ED) 31-1426, sheet 7B, line 47, family 169, 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 2657.
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DNA Connections
It may be possible to confirm family relationships with Frederick 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 Frederick: