His memorial on Find-a-Grave contains images of his obituary in the newspaper, and it is full of details about his family and his life, including his mother's maiden name as well as his wife's maiden name. According to his obituary, he was "one of the best known and highly esteemed residents of the township."[1]
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6MR-R8X : accessed 10 May 2016), Sarah E Coursen in household of Samuel J Coursen, Frankford, Sussex, New Jersey, United States; citing family 113, 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:MNDM-N4X : 13 August 2017), Georgia Coursen in household of Isaac Coursen, Wantage, Sussex, New Jersey, United States; citing enumeration district ED 187, sheet 230C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,799.
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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 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 Isaac: