"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MCYT-1VC : 23 December 2020), Daniel Sullivan in household of Daniel Sullivan, Martinsburg, Lewis, New York, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1855," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K6QG-STN : 27 December 2020), Daniel P Sulivan in household of Daniel Sulivan, E.D. 1, Martinsburg, Lewis, New York, United States; citing p. , line #12, family #174, county clerk offices, New York; FHL microfilm 900,775.
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DNA Connections
It may be possible to confirm family relationships with Daniel 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 Daniel: