Named on son Aron's death certificate, which describes him a Viehhaendler (cattle trader), deceased, last resident in Koschmin.

A hand-written note signed by a German police officer in Breslau and dated 1938 identifies Josef Tuch and Dorothea geb. Schulmeister as the parents of one Isidor Tuch and gives their dates and locations. Josef is described as a butcher born and died in Koschmin. His date of death is given as 1845, but this is probably a transcription error as the note was located in the police file for his son Isidor Tuch, who was born in 1848.