Sztencl was born on 16 August 1884 (25 Av 5644) in Czeladź, Poland[REF] to Rabbi Chaim Dov (Berish) Sztencl, av beis din of Czeladź and a distinguished Radomsker Hasid.
Freidel Genendel's sister, Miriam Kayla, married Hanoch Hendel Frumer.