Having some time to look at this, for the Kalisz-born ancestor, you would probably have to claim Polish citizenship if anything (unless your surname suggests something else). The family might have been all over Europe during WWI, and very likely their parents from Austria-Hungary given the proximity to that part of Poland and speaking German. So you would be looking at doing a lot of census tracking, before and after WWI for any deeper info.
If you looked at Ukraine citizenship right now you might end up getting conscripted (though I doubt that).
Having some time to look at this, for the Kalisz-born ancestor, you would probably have to claim Polish citizenship if anything (unless your surname suggests something else). The family might have been all over Europe during WWI, and very likely their parents from Austria-Hungary given the proximity to that part of Poland and speaking German. So you would be looking at doing a lot of census tracking, before and after WWI for any deeper info.
If you looked at Ukraine citizenship right now you might end up getting conscripted (though I doubt that).
That part of my family was already in the US well before WWI, in 1902. Their surname is German, BTW.
There was a different great grandfather who was naturalized in 1933, but for him I have the naturalization form that just tells me he was from Poland.
I really ought to continue with it, and look into the ancestry on my mom’s side.