I strongly believe that Martha Ann Hartzog Blakey is the child of John and Celia Mitchell.George H Hartzog was married twice - first to Sarah Tyler (no proof on her maiden name)and then to Celia (no proof on her maiden name.)The following is a transcript of the entry for Martha Mitchell.
1850 Barbour Co., AL census, page 134, number 379 Mitchell, Celia39 f, SC Mitchell, Eliza14 f, GA( This is Elizabeth Hartzog who m. Zachariah Benefield the next year) (Why she and Wm. below are listed Mitchell - I do not know.) Mitchell,William10 m, AL (Wm's family says he was born Apr 27, 1837) Mitchell, Martha8 f, AL(This would mean 1842, but could it really be 1843-when her mother married John Mitchell?Her birth is not 1837, though.) Mitchell, Mary7 f, AL Mitchell, Hiram5 m, AL Mitchell, Julia A.3/12 f, AL
With William Henry Hartzog's birth on 27 Apr 1837, it would be impossible for the birth of another child in 1837.
There is a hard copy of my book in the Enterprise, Alabama Library.