Removed death 1816 in Bellingham. I looked at the will and the age at death for that date/place and it doesn't match up well.
Sources
"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q29P-M1FM : 3 November 2017), Silas Thayer and Perley Pond, 20 Aug 1767; citing Marriage, Mendon, Worcester, Massachusetts, United States, , town clerk offices, Massachusetts; FHL microfilm 855,377.
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DNA Connections
It may be possible to confirm family relationships with Silas 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 Silas: