"Massachusetts Births and Christenings, 1639-1915", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VQDZ-T8B : 15 January 2020), Alfred Coffin, 4 May 1780, citing Birth, Nantucket, Massachusetts.
"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QPW8-X1TG : 11 May 2022), Alfred Coffin and Pegga Chase, 5 May 1805; citing Marriage, Nantucket, Nantucket, Massachusetts, United States, Massachusetts Secretary of the Commonwealth, Boston; FHL microfilm 007009742.
"Massachusetts Births and Christenings, 1639-1915", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VQDZ-XM7 : 15 January 2020), Alfred Coffin in entry for Roland Coffin, 9 Feb 1806, citing Birth, Nantucket, Massachusetts.
Find a Grave, database and images (https://www.findagrave.com/memorial/148148322/alfred-coffin: accessed 21 June 2023), memorial page for Alfred Coffin (1780–Oct 1810), Find a Grave Memorial ID 148148322; Buried or Lost at Sea; Maintained by John Speer (contributor 47558802).
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DNA Connections
It may be possible to confirm family relationships with Alfred 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:
G C :
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-BY34208, FTDNA kit #266234
Chip Coffin :
Family Tree DNA Y-DNA Test 700 markers, haplogroup R-BY60137, Ancestry member Chip_Coffin, FTDNA kit #954106