Gregg, I am a descendant of the Moses Kaylor and Joyce Harmon you mentioned in your message. My great-great grandfather (William M. Kaler) was, I believe, a brother of your Elizabeth Parmelia Kaylor, wife of John Harpham.
Much of the Kaylor (spelled Kaler by my family) family in northern Arkansas seemed to be pro-Union. Some of my family was involved in the Peace Society, including I believe, William Kaler. William was forced into the Confederate Army but later joined the Union Calvalry in northern Arkansas.
William Kaler, states in a document from the Southern Claims Commission (1872)that his "brother-in-law was killed while recruiting for the Union Army." I believe that the brother-in-law in question was John Harpham.This happened in northern Arkansas.
If anyone has any information on this family please e-mail me at firstname.lastname@example.org