French.. you people have no idea how Italy is.
I speak differently than my brothers because I grew up at my grandparents 3 MILES! away and if I go to my family restaurant 2 MILES the other direction there is a different accent again, and I mean different words too not just the sound. Where I used to go to school 10 miles away they don't understand if I speak my dialect because it's a different region.
The whole Italy is like that, a different dialect every 2-3 miles, every family, town, city, province, county and region has different accents and ways to make food and recipes. My town is 3200 years old, older than the Romans, they used to fight, then ally then fight again with them etc., this dialect thing is very old, cultures, traditions and families.
Of course we have the Italian language in common and the main dialects are separated by the main city of the region then by the region itself but yep, that's how it is.