Barend Monnikendam was previously married to Sophia Frankenhuis. She passed away in 1923. Philip, Henriette and Elzina were children from that marriage. Barend Monnikendam remarried in 1928 in Amsterdam to Marianna van de Kar. They had a daughter Dina.
Stadsarchief Amsterdam, archiefkaart Barend Monnikendam
In addition, a Jokos file (number 54319) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.