Do you have cemetery records, assuming they were buried locally? Or even from elsewhere if not buried locally?
I assume you have birth info (Month & Year) from 1900 census.
Do you have obituaries?
I have gotten much good info lately from GenealogyBank; the newspapers give much insight in our ancestors.
The Cincinnati Enquirer for the early years is available online via the Public Library of Cincinati, if you have or can get access.