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Dear Ms. Griffin,
Thank you for posting your request on History Hub!
The National Archives could maintain a copy of the Petitions for Naturalization. If you know which state the individuals resided in, you can contact the field office that maintains records for that state (learn more: https://www.archives.gov/research/naturalization).
If the naturalizations occurred post-1906, you may also be able to obtain additional records from the naturalization process (i.e. Certificate of Citizenship) by placing a request to the US Citizenship and Immigration Service (USCIS) Genealogy Program (www.uscis.gov/genealogy).
For additional, please check the blog post Immigration and Naturalization Records: Where are they?
We hope this information is helpful. Best of luck with your research!
[Information provided by Elizabeth Burnes, Subject Matter Expert]