↑ ["United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7KB-GJV : accessed 27 November 2016), John Sierzchulski in household of Boleslaus Sierzchulski, Ward 14, Milwaukee, Milwaukee City, Milwaukee, Wisconsin, United States; citing enumeration district (ED) 72-323, sheet 11B, line 55, family 191, 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 4554.]
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DNA Connections
It may be possible to confirm family relationships with John 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 John: