"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFGS-H7F : 12 April 2016), John Irby in household of Meads Irby, Virginia, United States; citing p. 104, family 789, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,149.
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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.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: