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Help required obtaining Polish Passport for Granny [10]
I had a similar case to your grandma. In fact, most of what I saw here was true in my case.
My grandparents supposedly "lost" their polish citizenship by becoming Venezuelan Citizens in 1951.
...Not so fast we said.
We began to study the law a little more and it turns out that there was something we could do to prove that my grandfather (who passed away a few years before) didn't loose his polish citizenship.
You see, he was an engineer for the polish army before the second wold war. When he became a venezuelan citizen in 1951 he had supposed lost his polish citizenship, but, because he didn't joint any other army in any country, and because he didn't get authorization from the polish military offices to became a citizen of Venezuela, he was still polish to the eyes of the law.
I got myself a goof attorney in poland who is used to dealing with these type of cases and now, I'm blessed with a polish citizenship as well.
I have family in Poland, who had never left poland. One of them, my father's cousin, is a history professor in some university in Poland. He was able to find documents in poland from even before the war, that proved my grandfather's involvement in the polish army and the public service in poland. That helped a lot. The attorney in poland is also good in finding documents too. If you need, I can send you the info and his website for you to contact them.
Over all, he charged us around 2000 Euros for the entire thing. This is for the process of citizenship for my father, my to brothers and myself.
Good luck in everything you do.