Source: Records of St. Servatius Catholic Church in Landkern, and Albert Emmerich of Cremlingen, Germany who provided the connection between the daughter of Johann Jakob Schnitzler and the wife of Johann Friederich.

Source: Records of St. Servatius Catholic Church in Landkern; and Albert Emmerich of Cremlingen, Germany.
Starting in 1754 Johann Friedrich lived in Gamlen, Cochem-Zell, Rheinland-Pfalz, Germany.
Johann Friedrich and his first wife, Anna “Barbara” Schnitzler of Wirfus, had two sons. He and his second wife, Gertrud Lauxen of Illerich, had nine children, of whom Johann Adam was the sixth.