Speak Italian at home:
New York MSA 242,396
Chicago MSA 38,001
Boston MSA 37,068
Philadelphia MSA 32,651
I wonder if they're speaking a "frozen in time" variant of late 19th/early 20th century Sicilian that has largely ceased to exist in Sicily. You occasionally read media stories about young Italian-Americans studying Italian in college to connect with their roots only to find that when they try to speak to their old great-aunt, she can't understand them.
Well, it's also true that Italy speaks a lot more than just Italian, and a lot of what are called dialects are very divergent from the standard. Plus you have distinct languages like Friulian and Sardu and stuff.
