U.S., Social Security Applications and Claims Index, 1936-2007
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It may be possible to confirm family relationships with Sergey 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 Sergey: