Here are the references to the Davidson family in the two Ayres books:

http://www.bishir.org/misc/hpsdavidson.pdf

http://www.bishir.org/misc/hohdavidson.pdf

Also I did a quick look in the David McBride books which are transcriptions of the county records of Highland. Here are the Davidson marriages and tax records:

http://www.bishir.org/misc/davidsonmarrtax.pdf

There were far too many pages referencing Davidsons in the wills, land records, and cemeteries books. I did notice that they had wills for Benjamin, Joseph and Margaret Davidson.

You may want to look for the McBride books in your local genealogical library - many have them in their sections on Highland Co., Ohio. Or you can get them from the Southern Ohio Genealogical Society.

Hope some of this is of use to you!

Don