I probably don't have much more than you have but will give you what there is - 4 children in lieu of 3:
James Polk Brown, b Mar 12 1854 Coffeeville, Yalobusha Cty, Mississippi.Married about 1875.Died Nov 13 1900 in Titus Cty, Tx buried Union Hill Cemetary.
Wife Virginia Serena (Jelnnie) Tabb b Sep 28 1860 Yalobusha. D Jul 16 1957 Titus Cty, Mt Pleasant, Ex buried Union Hill Cem
Children:(1) James Alexander Brown B Oct 20 1878 Titus Cty D Jan 2 1879 Titus Cty, Buried Union Hill Cem (2) Daniel Morgan Brown b Feb 17 1888 Titus Cty d May 28 1935 Titus Cty buried Union Hill Cem (3)Clara A Brown bor 1897 d 1944 Titus Cty buried Union Hill married Ernest W Road about 1915 - I have no record of chidlren. (4)G Polk Brown b Aug 3 1900 Titus Cty d Sep 14 1901 Titus Cty.
Due to early death, it appears that Daniel and Clara are the only ones that could have possibly had children.