Year of birth is guesswork based on wife's year of birth.
Sources
"Scotland Marriages, 1561-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XT2D-GXV : 8 December 2014), Thomas Hamilton and Jean Lyon, 20 Mar 1824; citing Loudoun, Ayr, Scotland, reference ; FHL microfilm 1,041,394.
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DNA Connections
It may be possible to confirm family relationships with Thomas 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 Thomas: