My ancestor Stephen Boswith Johnson, b. 1845 Scioto Co. d. 1908, Pana, IL, may be related to your Isaac. I don't know his siblings' names, but Stephen's parents may be George W. and Nancy Sowers Johnson who would've been born about 1820. Have photo of I.V.D.R.Johnson who is somehow related to us. (See my query and Hargiss answer about Isaac in March)Who are the parents of your Isaac? Let me know if there is any connection please.