Isaac Fonteijn and Sara Fonteijn-Jacobs had two children. Their son Marcus Fonteijn lived with his family at another address.
Addition of a visitor of the website
In addition, a Jokos file (number 005656) on this family is 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.