Search engines can be odd things. They don't aways find everything they should. I forget how I found Wrentzler. The name does create some problems because of the many possible ways it could be spelled including without the W.
The 1900 census with William C. Craig may or may not be a new lead. It could be Charles or then again it could be a brother. Probably the best things to do would be to get the obituaries and death certificates of the people you are looking for. If the elder Charles was in the newspaper business then he would most likely have an obituary which would list children and possibly siblings.