"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M44L-1R4 : 21 December 2020), John Bradley in household of Peter Bradley, Allegheny Township, Blair, Pennsylvania, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9PP-CB4 : accessed 3 December 2021), John J Bradley in household of Patrick V Bradley, Sausalito Township (excl. Sausalito town) Belvedere town, Marin, California, United States; citing enumeration district (ED) 61, sheet 11A, family 248, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,093.
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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: