I'm not a Brewer researcher but some of our Wilson girls did marry into a Brewer family in Wayne Co., TN. The information in my database was collected by others and should be verified but it might point you in the right direction.
The only Rial in my data base is; Rial N. Brewer b. 1854, son of George W. Brewer b. 1829 (wife Mary J. Unknown) son of William Brewer b. 1810 d. 1849 (wife Annie Unknown) son of Henry M. Brewer b. 1760 d. 1855 (wife Mary Cockman) father in-law to Wilson girls.
IIRC, this Brewer line is back to William Phisitian Brewer b. 1548, Somerset, England and includes George G. Brewer b abt 1670 d. 1744 (wife Sarah Lanier).
I hope thishelp a little, Gaylon@Wilson-Genealogy.com