[philman_36]

What did the law at the time of their birth say?
The laws of today are not the same laws at their their day of birth.

Find/link the law...since you don't give the year of their birth...and we'll go from there.

[Jim Noble]

My grandparents were born in 1893, 1894, and 1895 (x2).

They were never naturalized. The WW I draft cards of my two grandparents refer to each as “natural born”, to which the alternative was “naturalized”