1768 Andrew is attached to two wives - Violet Farmer, and Elizabeth Paxton_or_baxter (which is not an acceptable last name).
The Andrew Simpson (1808) currently attached as married to Elizabeth Bryan Bryson is the son of 1768 Andrew. This connection may be misplaced, and probably needs more investigation, as she is currently also the wife of someone in Ohio, they supposedly married in Ohio, yet she died in Scotland.