"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4DJ-2FM : 12 April 2016), Peter Decorsey, Watertown, Jefferson, Wisconsin, United States; citing family 596, 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:MN9B-YXF : 12 April 2016), Peter De Coursey, Wisconsin, United States; citing p. 15, family 121, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,228.
"Minnesota State Census, 1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQF8-T98 : 4 August 2017), Peter De Courcey in household of Hugh Hall, Gull River, Cass, Minnesota; citing p. 7, volume Aitkin, Carlton, Kanabec, Hubbard, Cass, State Library and Records Service, St.Paul; FHL microfilm 565,733.
"Minnesota Death Records, 1866-1916," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XPXC-T73 : 4 December 2014), Peter Decourcy, 06 Apr 1897; citing Minneapolis, Hennepin, Minnesota, , Public Health Center, St. Paul; FHL microfilm 1,499,020.
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DNA Connections
It may be possible to confirm family relationships with Peter 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 Peter: