John Glenn Brown Sr married Sarah E Riggins in 1859. To this union the following children were born:

Mary A E Brown, John Glenn Brown Jr, Louicia D Brown, Charity E Brown, Julius C Brown, James T Brown, Julia A Brown, Jacob V Brown, Jesse Elijah Brown, Joshua W Brown, Anna May Brown & Esley Chloe Brown

Also here is a biographical sketch that was done on him:

Biographies of Meriwether County, Ga. citizens
from Memoirs of Georgia, Vol. II, Atlanta, Ga.,
Published by The Southern Historical Association in 1895
John G. Brown
page 501-502

John G. Brown, who carries on an extensive farm in Meriwether county, of which he is a native, was born in 1835, and is the son of William and Mary (Owen) Brown. The former, a native of Jones county, was born in 1810, and settled in Meriwether county in 1832. His parents, John and Millie (Miller) Brown, were early settlers of Baldwin county, to which Mr. Brown, whose father, Moses Brown, was a revolutionary soldier, came from South Carolina. William Brown's wife was the daughter of George Owen, a Virginian who settled in Meriwether county in 1830. John G. Brown passed his early years on the farm, securing such education as was attainable in the old log school house. In 1861 he enlisted in Company B, of the Thirteenth Georgia militia, under Capt. Henry Baker. He served throughout the war, was in the battle of Atlanta, from July 19 to July 22, 1864, and other fights. He returned with empty pockets to make a new start in life. By prudence and economy, as well as diligence, his means rapidly increased, and he has added from time to time to his farm, and is now the owner of a vast plantation in a fine state of cultivation; he also runs a saw-mill and is a man of wealth and influence. He is an honored member of the order of masonry. In 1859 Mr. Brown married Miss Sarah Riggins, born in Upson county in 1838, daughter of Joshua H. and Winnie (Alford) Riggins. Mr. and Mrs. Brown have been blessed with twelve children: Mary A.E., John G., Lou D., Charity E., Julius C., James T., Julia A., Jacob V., Jesse E. (deceased), Joshua W. (deceased), Anna M. and Esley C.