Nephews and a niece Van Voolen; Second from the left Maurits (1909, the son of Israël van Voolen), at the right Maurits (1906, the son of George van Voolen), in the front Helena (the daughter of Gerrit van Voolen). The two other children survived the war.
In addition, Jokos files (numbers 2462, 38131) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.