On the 1930 census Wise Co, TX is a J.T. Minhinette(sic) 36 b GA, could he be Olivia's son John?If so, maybe this is him on SSDI and TX Dth Idx:
Minhinnette, Jack Thomas, b 11 Jan 1893; d 10 Jun 1983 Wise Co, TX; last residence Denton, Denton Co, TX; SS card issued in TX.
Also a Ruby Lou Minhinnette 1894-1992 d in Denton Co, TX, could be wife of John/Jack.His wife is just shown as "Mrs. J.T." on 1930 census.
Using an online directory http://www.switchboard.comhttp://www.switchboard.com there are two Minhinnetts in Denton, TX.There are five with that spelling in TX and two with spelling of Minhinnette.I would contact them see if they are connected, or if anyone in their family is working on family research.