Thank you so much!! I made him, his wife Roxanna DeHaven O'Leary and daughter Margaret O'Leary memorials on Find a Grave for Keithsburg Greenmound Cemetery. Roxanna O'Leary, his wife died Oct 1st or 13th 1886 so if there is an obit for her I'd LOVE TO HAVE IT. I don't know if any of the 3 of them have headstones. (I live in State of WA). Their daughter you said the obit referenced was Margaret O'Leary who died March 26 1870 (single).
The only information came from the family Bible of Cornelius O'Leary which is still in the hands of family. I don't know if any of them have headstones, so any information from an obit is helpful to family.