John & James Gilmore were two of the appraisers of the estate of Matthew Brewer who died in 1832, Marengo Co, AL. John Gilmore was named as guardian of Ransom & Matthew Brewer. Also, a John Gilmore, Jr. was listed.
Here are some AL marriage records that may help. Rabia, Kinchen - Gilmore, Betsey 15 Nov 1814 Clarke Gilmore, Charles - Lumsden, Julia 5 Oct 1820 Wilcox Gilmore, George - Newton, Ann 10 Dec 1818 Clarke Gilmore, John - Gray, Elizabeth 5 Mar 1818 Clarke Gilmore, John W. - Alston, Mary 6 Nov 1820 Clarke Gilmore, Starling - Turner, Nancy 21 Mar 1821 Clarke Gilmore, Stephen M. - Robinson, Elizabeth L. 13 Jul 1825 Wilcox