Here's what little I know of this far back. This info comes from two other dandy Gandy researchers and is not my own work, so you can thank them and not me!
We have a Brinkley Gandy m. Polly Harrell who had at least one son, Booka, b. ca 1742; they lived in NC. Brinkley married Martha Chambliss (Patty) around 1785; they then moved to SC when Booka was about 14 yrs. old.
Now, there are two Brinkley Gandy's -- father and son -- with respective dates of(1744-1832) for Sr. and (1764-1832) for Jr. Don't know a cause of death -- wonder about an accident.