"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M4HW-DX5 : accessed 16 Dec 2013), John Blair, North Shenango, Crawford, Pennsylvania, United States; citing dwelling 19, family 19, NARA microfilm publication M432, roll 771.
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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 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 John: