Simon van Kollem and Roosje van Bergen married in 1911 in Weesp. They had three children. Besides the here mentioned children they had a daughter Sara.
Stadsarchief Amsterdam, archiefkaart Simon van Kollem
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, Simon van Kollem had a bookshop at the Oudemanhuispoort 15 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives
In addition, Jokos files (numbers 9551, 5695) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.