"[Simon] Leuw was in hiding in Friesland (his father had enough contacts as a meat dealer) but returned - idealist as he was - to Amsterdam. He had no idea that he would be murdered. He reported to the authorities, because he thought he could be of help to his fellow Jews in their new environment." …
In addition, a Jokos file (number 31924) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.