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Well 23andme considers me 12% Polish, and AncestryDNA says something about 26% Eastern European ... I've always considered it to be misinterpreted Upper Silesian DNA though (Upper Silesia is close Katowice)
It'd make sense as one of my grandmothers (25% of my DNA) was born there.
We also have no knowledge of Polish names in our family tree at all. It might be theoretically possible that her mother (my great-grandmother) was Polish though as I know nothing about her. She fled to the US after the war and let her children behind, her husband (my great-grandfather) died in battle.
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