Abraham Schaap was a son of Willem Schaap and Elisabeth Groen. He married 22 January 1930 in Amsterdam to Sara Werkendam, daughter of Mozes Werkendam and Vrouwtje Marcus. website www.wiewaswie.nl.
In addition, a Jokos file (number 12562) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.