Heintje de Groot married July 1942 with 511424 . The couple went living with the de Groot family at the Snoekjesgracht. City Archive of Amsterdam, card Heintje de Groot
In addition, Jokos files (numbers 4049, 20364) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.