you "forgot" how history in this part of Europe messed with borders and family histories. 🤨
It could not mess with it, to a point you don't even know what country, let alone city, your ancestors lived in.
I know my family history going back to the 12th century. Which region we came from, whom we served, what my great-great-great grandfather did to earn his surname, etc.
These kinda rootless, homeless, clueless people really irritate me. I commend them for at least showing the curiosity, but it really is spitting in the face of your ancestors not to know where your grandparents emigrated from less than 200 years ago.