I saw your message asking about John Burnside born 1760 of Bryan Co., Ga. It was a couple years old but I thought I would send you this anyway.
I have a John Burnside born 1760, married to Delilah Sheffield. They had children as follows: William M. born abt 1800, Cynthia born 1802, Elizabeth born abt 1785, and James M. born abt 1803.
I have that John died in Bulloch Co., Ga. about 1827. Also that he was from Scotland. The Burnside name was changed in the mid 1800's to Burnsed. John Burnside is as far back as I have been able to find. I one line of his descendants up to present day to myself. Hope this helps.