Thank you both!
I definitely need more expertise than I have. My grandfather reported he was from Limerick. Moreover, he had a sister Joanna and his middle name was Cornelius. . He died around 1953 so we have to assume he was born in the 1870s or later. My father was born in 1909 in Brooklyn, so he was definitely there by then, although we don't have an exact date of arrival. I can't seem to get the NY death certificate, though if I ever do pry it out of the city, that may shed light on him.
What I've found via RootsIreland is: One family with a Richard Corneilius Ruth and a Joanna Ruth, both born in Waterford. (1883 and 1881). There is another Richard Ruth, no sister named Joanna, born in 1886. This would have made him 18 when my father was born...thus this does not seem right on either the age or the sister angle. Plus, I think I've tracked that "Limerick Richard's" death. (Two died, one in 1876 and one in 1882.)
Anyway, the Cappamore connection came about because someone found a Richard Ruth on a ship manifest and suggested that might be he. I have no idea. The above is all I truly "know."
Thank you so much for any help you can give me.
Betty