"New York, Church Records, 1660-1954," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QG5W-XXPH : 10 October 2019), William Knap and Mary Holly, 24 Nov 1782; citing Marriage, New York, United States, multiple churches, New York.
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: