R’ Aharon Yaakov Klepfish
R’ Aharon Yaakov, the Rabbi’s son-in-law, came from a large, well-branched and prominent family in Warsaw (his father was a cousin of the Chief Rabbi of Warsaw, R’ Shmuel Zeinvill). He was born in Szczuczyn in the year 1880. He was raised in the home of his maternal grandfather, Rabbi Yehoshua Heschel Shapiro, the Rabbi of Szczuczyn. When he was seven years old, his father became a shokhet in Warsaw, and the family moved to Warsaw. Aharon Yaakov studied well at the yeshiva there, and had a special teacher who instructed him in Russian, Polish, Hebrew and Arithmetic.