Marianna Schaap was a daughter of Abraham Schaap and Roosje Heilbron. A brother of Marianna was Willem Schaap, spouse of Elisabeth Groen. website www.wiewaswie.nl.
In addition, a Jokos file (number 55579) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.