You have to be careful with those Owen Thomas' Owen, James, Michal were real popular names for the Thomas' back in the early 1800's I think they were Welsh and originated with the Quakers back in Pennsylvania. I've put my Owen on the back burner right now, but if you see a connection please let me know.
This Owen had a brother named James also: Thomas-9893. He may be the grandfather
Then try Jonathan Thomas Sr., (Thomas-9894) son of above, born 1762 Orange County NC died 1838 in Grayson County, VA, May have served with Over the Mountian Men in Rev War. Married Patience Bourne 1786 in Montgomery County VA (now Wyeth)
His son, Owen was born 1791 in VA and agin, this Owen had a brother named James also!!!
I should have links on the page.