Question: What is the date of death of Ben Zion Aryeh Leibish Halberstam's father?
Sentence (from "Ben Zion Aryeh Leibish Halberstam"): A group of Hasidim loyal to Naftali's son-in-law, Mordechai Dovid Unger, founded the split-off faction of Bobov-45.
Relevant evidence: No