I, too have been searching for a Joseph Purkey who wed Frances Cassidy 1827 in Grainger Co., Tn. I found a Joseph Purkey ca. 1842 Gr.Co. court minutes. Also a Joseph Purkey was in Civil War from Grainger Co. but the above Joseph would have been too old for the war. Also, A Daniel Purkey and wife Judy (unknown) was related to this Joseph. In what way, I do not know. Daniel has lived in Roane, Grainger and lived in Hancock County Tn. in 1860. Do you think this could be your Purkeys?