Isaac was born in 1872. He is the son of Charles Davis.
Sources
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD2X-6HK : 14 August 2017), John Davis in household of Charles Davis, Grant, Greene, Iowa, United States; citing enumeration district ED 94, sheet 294D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0341; FHL microfilm 1,254,341.
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