Nonna is a word that means grandmother in Italian. If I italicize in the beginning like this: "Nine years ago, nonna (Italian grandmother), ..." then I don't have to continue italicizing the word however I'm confused about how to address this character in the future.
Since nonna means grandmother, do I use the word the same way I would use grandmother? For example, would i say "my nonna" as opposed to "nonna" even though I call her nonna? In other words, I say "nonna" to address my grandmother, as if 'nonna' is her name.