Johnston was born in 1844. He is the son of Andrew Campbell.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4HV-PQJ : 12 April 2016), Johnston Campbell in household of Andrew Campbell, Armstrong, Indiana, Pennsylvania, United States; citing family 114, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDJF-L6S : 12 April 2016), Johnson Campbell in household of Andrew Campbell, Iowa, United States; citing p. 5, family 30, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,873.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD23-S8M : 9 September 2017), Johnson Campbell in household of Andrew Campbell, Monona, Clayton, Iowa, United States; citing enumeration district ED 144, sheet 515A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0333; FHL microfilm 1,254,333.
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