Leslie, I know of no connection between Roderick Kellogg and Jonathan Kellogg unless it was prior to them moving to Ohio. Where was Roderick Kellogg born? When and where did he die? There are several Old Kelloggs that ended up in Geauga County in the early 1800's.I suspect that some were related but have not been able to confirm this. I found a Sarah C Kellogg that married Nicholas Silvernail 10/11/1853.Is that your Sarah Cornelia?