"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MK8K-CZH : accessed 7 January 2022), Thomas Kolar in household of Frank Kolar, Chicago Ward 34, Cook, Illinois, United States; citing enumeration district (ED) ED 1485, sheet 17B, family 390, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 281; FHL microfilm 1,374,294.
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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: