He must've been married previous to marrying Minerva, as his son James Jr. is too old to be Minerva's son.
He does not appear on the 1840 census for Campbell co. GA, but there are three other Watson men resident there -- John, John P., and Samuel H. However, from the 1850 census we know that John P. and Samuel H. Watson were both born in Virginia, making it unlikely they are close relatives of James Watson (a South Carolinian).
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZYJ-BMJ : 12 April 2016), Jas Watson, Campbell county, Campbell, Georgia, United States; citing family 438, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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It may be possible to confirm family relationships with James 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 DNA with James: