Jakob Heijmann and Amalie Goldschmidt married on 11 December 1910 in Hamburg. Their sons were registered as 'Haimann'.
Stadsarchief Amsterdam, archiefkaart Jakob Heijmann
In addition, a Jokos file (number 13736) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 4628/6176).