Feeney Family Genealogy Forum
Betty, I only have research on Feeneys in Galway. So your asking about a Dennis Feeney age unknown parents unknown born somewhere in Ireland. I'm afraid there would be thousands with no way of telling which one is your ancestor without further info. What about the US marriage & death certs & naturalisation: they should have some info for you.
When you have further info, remind me & I'll have a look at my research for you.
Good luck with your research, Ron