First and foremost, the parents of Lydia Harrison-Gragg are Jeremiah Harrison (1707 – 1777) and Catherine Adams (1711 – 1764).

She married Robert Gragg Sr (1732 – 1796) in 1754, in Augusta, Virginia.

They reportedly had the following children:

Robert Gragg, Jr. (Born in 1755, in Augusta County, Virginia)
Samuel Gragg (born 1757, in Augusta County, Virginia)
Ann Gragg (born 1759, in Augusta Co., Virginia)
Thomas Gragg (born 1761 in Augusta County, Virginia)
The above is taken from “Gragg Descent”

Additional children:

Abegail Gregg (born in 1752, in Augusta County, Virginia)
Henry Gragg (born in 1755, in Augusta County, Virginia)
John Gragg (born in 1765, in Augusta County, Virginia)
Sarah Mary (Polly)Gragg (born in 1766, in Augusta County, Virginia)
Elizabeth Gragg (born in 1777, in Augusta County, Virginia)

The above are taken from Genealogy sites that have Source Material Claims; so they should be reliable.

Hopefully this answers all of your questions.

Ron Gragg