"New York State Census, 1855," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K63Y-LB2 : 27 December 2020), David B Coock, Masonville, Delaware, New York, United States; citing p. , line #19, family #32, county clerk offices, New York; FHL microfilm 832,847
"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MWVX-Z66 : 13 November 2020), David B. Cook in household of Abram M. Cook, Susquehanna, Pennsylvania, United States; citing enumeration district ED 128, sheet 239D, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,196
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DNA Connections
It may be possible to confirm family relationships with David 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 David: