All 4 of my grandparents were from Sicily. My parents spoke to each other in the Sicilian Italian dialect, but spoke to us only in English. Wanted us to learn the correct Italian taught in our school.
Ditto for the wife. “Kitchen Sicilian” is what she called what they spoke. She can’t speak it, but understands it. We visited her relatives in Sicily and they started speaking Italian. Her cousin had to tell them to speak Sicilian so that she could understand
Me - I speak Spanish and had. A hard time with both Italian and Sicilian..