1910 Census: "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLH2-W6V : 29 October 2015), Leonard Decoursey, Franklin, Canyon, Idaho, United States; citing enumeration district (ED) ED 284, sheet 6A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,236.
Death: "Idaho Death Certificates, 1938-1961," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2M1-K6DW : 1 February 2016), Leonard De Coursey, 08 Apr 1938; citing Death, Nampa, Canyon, Idaho, United States, Department of Health and Welfare, Boise.
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DNA Connections
It may be possible to confirm family relationships with Leonard 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 Leonard: