Nathan Hammelburg and Julie Rosalie Cohen married in 1919 in Amsterdam. Besides the here mentioned children they had a son Simon Antonius who passed away in 1928.
Stadsarchief Amsterdam, archiefkaart Nathan Hammelburg
In addition, Jokos files (numbers 30993, 3815) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
A Liro card exists for this person or family. The original cards are kept at the Nationaal Archief (National Archive) at The Hague.