Looks like the mother of the Clark brothers remarried.
1900 census Dallas Co, TX - I suggest you take a look at this, some of it is so dark almost unreadable, but you might recognize names etc.
Cline, ____, hd, b Sep 1867, 32, M 10 yrs, b TN, TN, TN
"_____, wf, b (May/Mar?) 1867, 33, M 10 yrs, 5 ch, 5 lvg, b _____
" _______[last family member on this page, can't read it]
top of the next page much clearer:
Cline, Hester, d, b Apr 1894, 6, b TX, TN, TN
" Rosa, d, b Ma 1896, 4, b TX
" John, s, b May 1898, 2, b TX
Clark, James H., stepson, b Dec 1884, 15, b TX, TN, TN
" Edward, stepson, b Jun 1886, 13, b TX, TN, TN
[Birth location for the father of the Clark brothers may just be dittoed in the same as the Cline children.]
Happy Hunting (^_^)