"New York State Census, 1855," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6Q2-ZRQ : 13 March 2018), Isaac Decker in household of James Decker, E.D. 2, Cape Vincent, Jefferson, New York, United States; citing p. , line #11, family #104, county clerk offices, New York; FHL microfilm 895,241.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNHR-CDV : 14 September 2017), Delos Decker in household of James Decker, Warren, Waushara, Wisconsin, United States; citing enumeration district ED 196, sheet 373D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,452.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MM25-K7B : accessed 29 June 2020), Delos Decker, Warren town, Waushara, Wisconsin, United States; citing enumeration district (ED) 115, sheet 8B, family 58, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,823.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MP2G-44P : accessed 29 June 2020), Deloss Decker, Warren, Waushara, Wisconsin, United States; citing enumeration district (ED) ED 113, sheet 6A, family 117, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1738; FHL microfilm 1,375,751.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF2X-Z4M : accessed 29 June 2020), Delos Decker in household of Lillian Decker, Warren, Waushara, Wisconsin, United States; citing ED 175, sheet 4B, line 87, family 80, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 2022; FHL microfilm 1,822,022.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X938-WB3 : accessed 29 June 2020), Delos Decker in household of Lillian Decker, Warren, Waushara, Wisconsin, United States; citing enumeration district (ED) ED 22, sheet 4A, line 8, family 71, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2618; FHL microfilm 2,342,352.
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DNA Connections
It may be possible to confirm family relationships with Isaac by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Isaac: