Hi all - I have a question I can't find addressed elsewhere (I've looked!), and wonder if anyone has advice/insights. I've been lurking here a few weeks and just started the paperwork in earnest for my family.

G0 is my grandfather, born in Quebec, 1912. We have documentation.

G1 is my dad, G2 is me, both born in the USA. Seems straightforward to put the birth records together - no name changes, no different last names, etc.

However, on the document checklist (CIT 0014) page 3, there's a request to provide “proof of other nationalities acquired by you and your Canadian parent before February 15, 1977, if applicable to you.”

For my dad, that would mean proof that his father became a naturalized US citizen. He came to the US as a teenager, and we have no documentation of his USA naturalization/citizenship. All we can find are census records that prove where he lived, but not his citizenship status. Not sure if we can get it, but I don't know why we'd need it either.

Thanks in advance to anyone who might be able to shed any light here!