This looks like Nancy's brother William.
1900 census Kaufman Co, TX:
Langston, William B., hd, b May 1875, 25, b TX, IL, TN
" Elvira, w, b Sept 1874, 25, b IL, IL, TN
" Otto, s, b Sept 1898, b TX
" Ollie, d, b Sept 1898, b TX
1910 census Swisher Co, TX:
Langston, William B., hd, 35, M(1) 14 yrs, b TX, IL, TN
" Elvira, w, 35, M(1) 14 yrs, 5 ch, 5 lvg, b IL, IL, TN
" Ollie, d, 11, b TX
" Otto, s, 11, b TX
" Audra, s, 6, b TX
" Mable, d, 4, b TX
" Myrtle, d, 5/12, b TX
1920 census Swisher Co, TX:
Langston, Will B., hd 45, b TX, U.S., U.S.
" Elvira, w, 45, b IL, U.S., U.S.
" Ollie, d, 21, b TX
" Otto, s, 21, b TX
" Mable, d, ?, b TX
" Myrtle, d, 12, b TX
" Gladis, d, 4, b TX
Combined info TX Dth Idx and SSDI:
Langston, Otto, b 13 Sep 1898, d 26 Mar 1988 Briscoe Co, TX; last residence Tuia, Swisher Co, TX.
Using an online directory there are two Langstons at the same address in Tulia.Just type in surname, Tulia and TX.
Do you know when and where Hiram died in IL?Did he own any land?Did he leave a will?In a will he might leave everything to younger children of second marriage, but if not, then all his children would be heirs.See who shows up in probate and land records.All heirs will sign off on final sale of land to give clear title to buyer.Good way to pick up married names of females in the family.
Happy Hunting (^_^)