James House & Margaret Hartley

I'm searching for better support for a couple of events.First, there is a synopsis of a John Hartley will (1784) in Hampshire County, Virginia, that lists Margaret as his daughter (6th child).Second, Margaret Hartley is shown in several family trees as marrying James House, probably circa 1800.There is an insciption on what appears to be James House's gravestone at Cherry Orchard Cemetery that says "Remember Me Margaret House."Based on the 1850 census, Margarget appears to have died before James.Is there any solid source that shows that James House's wife was Margaret Hartley, and that she was the daughter of John Hartley?Thanks.