James Black was born about 1768, probably in Virginia. He is the second oldest son of Henry and Martha Black.
On April 3, 1797, James Black, "son of Henry and Martha Black of Rockbridge County," married Nancy Martin in Amherst County, Virginia. A son, Henry, was born to them on 2 September 1804. It is likely that one, possibly more, babies were born before and after Henry, but their names are not known to me.
Possibly, James Black married a second time in 1818 to Margaret Moore. However Oren Morton's "History of Rockbridge County" notes that the James who was the son of Henry and Martha Black may not be the same James who married Margaret Moore. Or ... he may be. There is not enough evidence to prove it either way.
It doesn't appear there were any children from this second union, if indeed there was one.
In the 1810 Federal Census for Rockbridge County, James Black is listed with 10 other persons residing with the family. Two males, born between 1800 and 1810, one of whom is Henry, and two females born during the same range, appear to be the children of James and Nancy. Possibly more children came later.
In 1841, James Black is listed as a taxpayer of Rockbridge County in District 23, "Redbudin Opossum Hollow to center Buffalo bridge."
There was a James Black who died between 1832 and 1842 (and had children named Henry, Patsy, Nancy, and Polly). He lived two residences away from our Henry, per the 1830 census. Also per that census, he was 50 to 60 years old. This may or may not be the same man as Henry's father.
http://freepages.genealogy.rootsweb.ancestry.com/~cowsert/genealogy/surnames/black.html