Hi Charlie, Glad you're getting some time for your own research.(^_^)
I didn't find an exact match for the spelling on the Heritage Quest 1910 TX census index, but using Soundex method, the following are probably the two Ancestry showed.
1910 Starr Co, TX, ED 114, Sh 15B:
Olivares, Seferino, hd, 43, M(1) 17 yrs, b TX, MX, MX
" Fransisca G., de, w, 1, M(1) 17 yrs, 8 ch, 4 lvg, b MX, MX, MX
" Erlinda, d, 15, b TX
" Pilar, s, 10, b TX
" Santos, s, 6, b TX
" Juan, s, 3, b TX
Seferino is listed as farmer, owns farm free and clear.
Another "close" match.1910 Austin Co, TX, #D 3, Sh 14A:
Olibar, Seferino, hired man, 38 sgl, b MX, MX, MX
Index shows spelling Olibar, after looking at the handwriting, I question it.
Happy Hunting (^_^)