Nana is an name for grandmother in English speaking countries .
In Italian the actual word for grandmother is Nonna slang would be Nonni or Nonnie
The I in Italian is usually the plural form but in this case I believe it's a slang term of endearment sort of like Mommy or Daddy. Italian having no letter Y the I would be used and has the long e sound.
grandfather is nonno. Interestingly the masculine form disappeared more quickly in this country. Probably because first generation women tended to hold on to there native language longer than their male counterparts
The man had to go out into an English speaking world but when he came home it was more typical of the culture they left behind.
In northern Italy sir names are usually written in the plural form
To indicate your a member of a family or house.
The letter I would indicate plural. ( yes cannoli is plural.)
The south vowel ending a or o depends on the word's gender.
A is feminine O is masculine.
To the original point gravy has no Italian basis but was adopted by large segments of the first generation Italian American community. One of those interesting adaptive phenomena. It's usage is geographically fairly widely distributed. Yet completly unknown in some Italian communities.
I believe it's mostly used by immigrants from the southern regions.
Sauce is more of a direct translation from the Italian Salsa