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Expat kids in schools in Poland [77]
I hope some absurdist film maker will follow your adventure - you want to escape from immigrants who don't speak German by becoming an immigrant who does not speak Polish. In doing so you face the same difficult decisions and insecurities that your average Mehmet would when he turns up in Frankfurt.
My take on school is like this - my kids have Polish names and spoke native Polish but with some mistakes when they started school (Polish state school - I could not spend all day driving across town to international school). There has never been bullying but there has been the odd incident and a few tears. Your kids will probably only attract attention at times when they compare the how things are in Germany with what they are like in Poland. I do not think it will be easy unless they get to a good standard in Polish first - which means Polish at home and Polish on the TV. In my younger kid's school there are a handful of kids from Ukraine and also a mixed race kid born in UK - I don't know if they get bullied but nothing has been mentioned and they all seem to speak Polish well.
The curriculum is not static and so don't assume that it will be set in aspic for the 12 years your kids will be at school. At the moment it is quite heavy on some aspects of modern Polish history that fit in with PiS ideology. But you know most of the time they are doing math. science, languages etc.
You also need to understand that Poland and especially a big town like Szczecin is not some kind of right wing wonderland with 1950s values - yes most Poles are kind of conservative but the support for PiS is somewhere between 30 and 40 percent and most of that comes from old people and the countryside. They have attracted a lot of young family voters too but it is about their 500+ program and free medicine etc rather than caring about Gays or Transgender issues. The number of working age employed people who share your views in Poland is maybe 10% and n Szczecin maybe more like 5%. Those tend to be quite into the church too so assuming you are Catholic that might be the best place to make contacts with like minded people.