Zbyskek Siwinski research
According to DNA Zbushek has 2 known close last names with 2nd cousin matches: Himmelstein, Sirkin , and one last name from this group (Grinker,Anker,Rosenfeld). It is clear, that Himmelstein is his paternal side family, while it is not clear if it is PP, or PM side, since Himmelsteins with YDNA at FTDNA have different
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