In Geni It is written that his father-in-law was Rabbi Baruch Kahana Katz:
Rabbi Yehuda Leib, of Tiktyn
But, according to Dr. Wander, the information is incorrect, and his father-in-law was Rabbi Yehuda Leib of Tiktyn, son of Rabbi Mordechai A.B.D. Tiktyn, son of Rabbi Yehuda Leib of Lublin
Does anyone have any solid info on who his real father-in-law was?