In 2007 Ed Griffin posted on Ancestry’s JOSLIN board that, “Norman Conrad Joslin b. Feb. 1910 Dyer county TN. N.C. Joslin being my maternal grandfather.”

http://boards.ancestry.com/surnames.joslin/344.1.1/mb.ashx

Good luck from Reg Niles,
author of The Reg Niles Searchbook for Adult Adoptees (2013). Some libraries having this book are listed by WorldCat.