probert: There is nothing special you need to do,
actually they don't just become PL citizens automatically.. you'll have to file the paperwork and pay out the dough nut that is pretty simple
Yeah, it's not like they are born and poof, here is their citizenship paperwork for being Polish citizen. Now, the US citizenship, the day they are born, their birth certificate stating they were born in the USA is automatic proof of their citizenship. So, you have to show proof of their Polish citizenship. Again, contact the consulate for clarification. There IS paperwork and fees involved. Good luck! And glad you love Poland, my husband does as well and we hope to one day retire there...