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Son of Rabbi Tzvi Hirsh Isserles, BESHT son [of Pinsk] and Malka (Bella) 2nd wife Tzvi Hirsh, of Pinsk Father of Sima Auerbach and Rabbi Tzvi Hersh of Tshudnov Brother of Sheina Rochel of Ulanow, granddaughter of Baal Shem Tov; Rabbi Aharon, of Titov - Besht Gd.child and Unsourced son - probably wrong link Rabbi Ratzferth, [undocumented son?] Half brother of Rabbi Yisrael Isserles, "The Silent" of Paovlich, BESHT Gd.son and Sara Reizel Auerbach
https://en.wikipedia.org/wiki/Baal_Shem_Tov_family_tree