With my great-grandmother's brother there is no naturalization paperwork just a draft registration card where he lists himself as a naturalized citizen. For my ggm herself there is a ship manifest from november 1928 saying her naturalization paperwork was issued earlier that year.

Also I read up on ...

Ok thanks for clearing that up. As a follow up to that, would my great-grandmother have lost Italian citizenship when my great-grandfather became a naturalized American citizen in 1917?

Also, that wouldn't explain why my great-grandmother's brother had to become a naturalized U.S. citizen.

I don't think that reasoning would work because that is stating other countries citizenship laws submit to Italy's (e.g. child has to follow citizenship of father). So that rule only works so far as they would not be an Italian because their father was not Italian.

In the scenario where there was some special situation with residency causing her not to recieve U.S. citizenship from her father what would that make her? Stateless?

She was born in 1896, three years after her father naturalized (1893). Also her brother who was also born in Italy (1895) after their father's naturalization but on his draft registration cards from WWI and WWII. Do you think it might be possible that my GGGF lied to census takers about being a ...

I would think that too, but all the census reports seem to say differently. the 1915 census lists her as an alien, the 1930 census lists her as naturalized but gives no date, and a ship manifest from november 1928 arriving from naples says she was naturalized april 1928.

Even if she was a U.S ...

If the parent's of a minor child of Italian citizens become naturalized in another country with jus soli (in this case america), does that minor child lose Italian citizenship?

I am trying to figure out if my great-grandmother was an Italian citizen. She was born 1896 in Italy to former Italian citizens naturalized in the U.S. in 1893. She was not an American citizen until she became naturalized in 1928, but I don't think she was a Italian citizen at birth because even ...