Yes, for Italian citizens, it’s 3 generations removed. I’ve got a friend who’s grandparents were born in Italy, so since he’s only 2 generations down, he is dual American/Italian citizen.
His kids are also dual citizens.
However, THEIR kids will not be.
Same with Ireland...parent or grandparent.One of my grandparents was born in Ireland so under Irish law that automatically made my father a citizen at birth...despite having been born here...and it means that I can apply by submitting birth certificates,marriage certificates,etc proving lineage. But I haven’t done so so although I’m eligible I’m not considered a citizen until I submit the papers.
I read there’s no limit on generations for Italian citizenship, but there are other restrictions:
https://www.italiandualcitizenship.net/italian-citizenship-by-descent/
The story goes that, if we meet the requirements, we only need to fill out paperwork and pay a few hundred dollars for dual citizenship USA and Italy.
It’s probably more complicated than that, but it’s easier than the process other people would have to take.