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In page Chaim Kanievsky:

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Kanievsky was born January 8, 1928, in Pinsk, Second Polish Republic, to Rabbi Yaakov Yisrael Kanievsky, the Steipler Gaon, and Rebbitzen Miriam Karelitz, sister of Rabbi Avraham Yeshayahu Karelitz, the Chazon Ish. He married Batsheva Elyashiv, daughter of Rabbi Yosef Sholom Eliashiv.[1]