Mara Thorson says that Heimann had 12 children, UN names 14. Kaethe Danziger (geb. Halberstaedter) names 11 children, (omitting Elisabeth, Mathilde and Else) believing them to be Bertha Gassmann's cousins - in fact, Bertha is their aunt because Heimann is her youngest brother.

An entry in the 1905 Gleiwitz address book for Nicolaistrasse, 7 (home to his son Max), states that the premises was owned by Heimman Gassmann of Breslau. At this time he would have been 75 years old, so it is likely that he had retired to Breslau; one of the death announcements places him there.



A 1901 legacy to the Israelitischen Kranken-Verpflegungs-Anstalt und Beerdigungs-Gesellschaft in Breslau for RM12,000 in the names of Heimann Gassmann and Johanna Olschowsky and a mausoleum bearing the inscription "Familie Heimann Gassmann" in Breslau's old Jewish cemetery would appear to confirm this.

A 1908 letter filed with the legacy bears the heading of "H Gassmann, Eisen Grosshandlung, Gleiwitz"; this would appear to equate him to the Heinrich Gassmann of Gleiwitz whose iron and steel goods business was registered in 1862. Likewise, the death announcements link him both to Johanna geb. Olschowsky and the Gleiwitz firm.