I have a Joshua Brigman, b. abt 1750 in Anson/Surry Co., NC and brother to my gggg grandmother, Mary Bridgman b. 1755 NC d. 1823 AL. Their father was Thomas Brigman, b. abt 1730, d. b/f 7/13/1774, NC. His spouse is unknown by this researcher. Other children of Thomas were Isaac, William and Thomas.
I doubt seriously that I would be of much help to you on that family; however, considering that it could be the family of one of my gggg gmothers, I am interested in what you may have found and what we might share. I have some extended info on several siblings.