Samuel BROOKIN and Martha FORTSON married in Louisa County, Virginia on 13 April 1818, Martha identified as "dau. of Stephen Fortson"sur. Stephen Fortson (Source: "Marriages of Louisa County, Virginia 1815-1861" compiled by Wm Kiblinger and Janice Abercrombie, 1989, pg. 12)
Also, from "Marriage Records of Roane County, Tennessee 1801-1855" by Willis Hutcherson and Marilyn McCluen, some additional FORTSON marriages, Roane Co., TN:
Stephen FORTSON and Peggy WEST21 Feb. 1827 (pg. 89) Bazzel D. FREEMAN and Elizabeth FORTSON 31 July 1827 (pg. 90) George DAVIS and Mary Ann FORTSON19 Nov. 1832 (pg. 120)
I believe all of these individuals are siblings, issue of Stephen FORTSON and Elizabeth (UNKNOWN). See previous posts.