Per Nancy's marriage record to Erskine Robertson, her father was a Thomas. In the 1820 census, the Robertsons lived in the same district of Henry Co as a Thomas Bryan who was ennumerated next to a son Edmond Bryant. Due to the number of daughters in his household, this appears to be same Thomas Bryan living in adjacent Franklin Co in 1810. In the 1810 census, son Edmond appears to have been mis-ennumerated in the wrong column.
One thing for sure is that this Thomas Bryan was born WAY TOO LATE to be the man who married Mary Stanton 1783 in Culpeper Co, VA. Due to Thomas' location (not far from Bryan Station) and naming pattern of Edmond (Nancy named a son Edmond Bryant Robertson), he was probably a son or nephew of the Edmond Bryan who did a lot of land transactions in Spotslyvania Co, VA starting in 1778 and migrated to Bryan's station KY