A collection of family records, with biographical sketches, and other memoranda of various families and individuals bearing the name Douglas, or allied to families of that name, by Douglas, Charles Henry James, 1856-1931 https://archive.org/stream/collectionoffami00doug#page/166/mode/2up
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4DP-C6F : 12 April 2016), Oscar G Douglass, Sharon, Walworth, Wisconsin, United States; citing family 190, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNHL-8N4 : 23 August 2017), Oscar Douglass in household of Wallace Douglass, Walworth, Walworth, Wisconsin, United States; citing enumeration district ED 237, sheet 242D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1450; FHL microfilm 1,255,450.
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DNA Connections
It may be possible to confirm family relationships with Oscar 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 Oscar: