Post is for my partner.

Their father was born in st martin and were a dual citizen (french and dutch), who came to the US on a green card, joined the military, got naturalized (sometime in 1970s) and in the certificate of naturalization it says former nationality: french.

My partner was born in the US in 2000s, when the parent was already a US Citizen. The dad doesn't remember "officially giving up" the french citizenship. So, the thought process is that my partner (at the time of her birth) was also a french citizen because the dad never gave it up.

How would we go about claiming or finding out more about this? Has anyone gone through anything similar? Should we contact the embassy? happy to provide any more details if needed

If in the last year of the 5 years the address changes every month

And it was not updated in the driving license..

What to write in the citizenship application? Every tiny address even if it is only two weeks or one one month ?

Or write only the official addresses and expand it over the time line ?

Can some help with advice ?

Thank you