I'm sorry, but I do not know Abraham's siblings or parents - have narrowed it down to Jesse Brooks of Anson County, North Carolina or Ephraim Brooks of Pitt/Anson County as his father - POSSIBILITIES only. Have you tried joining the Brooks family DNA site? It is not my line - but it seems like several have mentioned Middleton when discussing Micajah. My father's line does not match their line (DNA).
The Brooks Family DNA group has been doing some wonderful things - alot of people have found matches and ancestors 3 or 4 generations back from where their own research took them.
I'm sorry I can't help you with Middleton, but if you find that you have connections in the Coweta, Meriwether, Jones counties of Georgia - let's compare!