Hi Jean: I just received a file yesterday regarding the descendants of Hezekiah Cranfill. According to this file William married Edith Trivitt in 1850 in Wilkes Co., NC. It states rather vaguely that "They moved to Arkansas in 1851 along with Edy's parents, Thomas and Patsy and brothers." I don't know if this is supposed to mean Edith's brothers or his, but according to family lore two of her brothers named Josh and Lye accompanied them to Arkansas.
This file also shows that my William C. had a brother listed as Thomas M., b. 1839, and a Nathan O., b. 1848. It also shows that Thomas M., m. Lydia C. Danner, b. 1841. No dates or locations are given. They had at least one child, Nathan A., b. 1859, no location given. There is no further information about Nathan O.
Doesn't sound like I helped you much, but if you'd like a copy of this file write to me at firstname.lastname@example.org, and I will gladly send it to you.