They also, though, spoke Irish, according to Uncle Jack:
My grandparents did speak Irish but not when they came to the US. I never heard them speak in Irish. However, a story told by my grandmother: My Grandfather used to play Eueka (an Irish card game). His partner also spoke Irish. Their two opponents did not speak Irish. My Grandfather and his partner would converse in Irish about their game strategy. Alas, an Irish trick.