I have a Nancy J Plumlee b. 9 Jul 1861 in Johnson Co., TN; d. 7 Nov 1897 buried in Ward Cem., Franklin Co IL; Married Dewitt C. Ward on 22 Apr. 1876. She was the Daughter of Mariah Plumlee and Wiley Coleman Arterberry.
Hunter Ray and Alvin Green "Greenie" Plumlee were cousins, but not first cousins. They share Denton Plumlee and Nancy Johnson as ancestors.
Hunter was the son of John J. Plumlee and Sylvesta Moss. John was son of William and Lavona. William was son of Denton and Nancy Johnson.
Alvin Green "Greenie" Plumlee was son of Andrew Jackson Plumlee and Agnes D. Pennington. A. J. was son of George H. Plumlee who was son of Samuel B. "Black Sam" Plumlee,who was son of Denton Plumlee & Nancy Johnson.
Your use of the name Nancy Arterberry Plumlee confuses me. The way I have it is Nancy Arterberry Ward, and she was the daughter of Mariah Plumlee Arterberry.