Barbara, My husband is descended from Mary Brewer thru her daughter Lydia Susan Brewer. Mary's husband is currently unknown. Mary appears on the 1850 census in both Habersham & Franklin Co., GA. Also in 1850 Franklin Co., GA is Jackson Brewer.
1850 Franklin County GA Dist 32page 256 Jackson Brewer 27 GA Mary22 Nancy9/12
I've not found any member of this family on any subsequent census. I'm hoping you might come across some information on this Jackson Brewer as you work on your own. Thank you in advance for any tidbit you come across.