I expect you have already searched census records county by county of the time period you think it might be.Many times that give you a foot hold in establishing where they live at a given time. The census records sometimes give you quite a bit of info like where the parents were born and such.That’s just a thought.Were you familiar with the web site of Nathaniel and Avis Hickman?
I am assuming you descend from Nathaniel and Avis Hickman. In the event you do I would appreciate it, if you know a male Hickman from that line advising me.I would like to find a willing participate for the Hickman DNA project from that line.
BTW checking the Adams gen forum board may be of help also. Addie here