Hi Mark, saw your message and although i don't have any info to offer was just letting you know that i just found a brinson in my husband's tree.
Her name was Sarah A. Brinson and she married Jesse Edward Keetley in 1902. She was born in about 1880 i believe and died in 1915. They were both from around the Berkeley/Charleston, SC area. Were both born, raised, died and buried there. Haven't found much on them yet but am trying. Thought maybe Sarah would tie in at some stage with your Brinsons.