Simon Zwaap and Sara Manheim lived also on the Nieuwe Prinsengracht 56 I. On this canal lived also Simons brothers Wolf and Michel Zwaap.
Addition of a visitor of the website
In addition, a Jokos file (number 20970) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.