I just saw your posting. I don't see any replies here, but maybe you have received some privately??
Anyway, I can give you some info on the True side of the equation... Emily M. True is the daughter of Peter True and Cynthia Koon. Peter is the son of Samuel True of Candia, NH and Zerviah Currier (although I have seen a different last name)of tamworth, NH. Samuel is the son of Elijah True of Salisbury, MA and Susan Clifford of Kensington, NH
I did find a website on ancestry.com that has excellent info (vital record sources are listed) on Reed Reuben Davis and family.
As it turns out Emily M. True is the 2nd of 5 wives of Reed Davis.
I can give you census results if you are interested.
There is also a True website on myfamily.com if that interests you. Possibly if you posted to this site someone might have further info on the Davis mystery-puzzle.