David: I am wondering if you have found a will for Isaac Calvert. It may be that he died in Morgan Co., OH where his daughter Sarah Calvert Dye lived, and where Robert's son's Rezin and Hiram lived. I have not had a chance to check this out yet. Also, I have a source that has the Dye's moving on to Zionsville, IN where Isaac's wife, Frances died. Jim Ray