William was born about 1797. He passed away in 1881.
Sources
Family Search family Tree
Find a Grave, database and images (https://www.findagrave.com/memorial/28670515/william-crossman: accessed 24 February 2023), memorial page for William Crossman (1804–1881), Find a Grave Memorial ID 28670515; Cremated; Maintained by Paul (contributor 47009728).
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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: