First born child, from bio on DAG. Please add sources.
Sources
Find A Grave, database and images (accessed 04 February 2019), memorial page for William Sportsman (1765–1812), Find A Grave: Memorial #124586675, citing Old Lorimier Cemetery, Cape Girardeau, Cape Girardeau County, Missouri, USA ; Maintained by Our Family Genealogy (contributor 47796684).
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DNA Connections
It may be possible to confirm family relationships with Jacob by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Jacob: