That is interesting, I had found Thomas (J. H.) Wakefield on the 1870 Denton Co., TX census, but I didn't know where the family went after that and was left hanging. I found an 1880 index of Denton Co. (on line) listing a Missouri Allen and am curious if it is the same Missouri you mentioned… or were the nieces listed as Smarts?
This is what the Index had
Name - State - County - Location - page - year Allen, Missouri - TX - DENTON CO. - E. D. 106 - 125 - 1880
Also, were there other children listed with Tennessee and James Mitchel? They both had children from previous marriages, but was told that they had three or four children together.