Heinz came to the Netherlands in February 1939. First he stayed at the quarantine facility in Rotterdam, then in Gouda, quarantine Zeeburg in Amsterdam, Oostelijke Handelskade 12, Driebergen (Huize Kraaijbeek), and back to Oostelijke Handelskade 12. Then he moved in with his uncle in Amsterdam.
His mother was Hanna Magnus, born on October 20th, 1897 in Bücken. She was deported from Münster to Terezin on May 12th, 1943 and from there to Auschwitz on October 9th, 1944 (Gedenkbuch).
Last address in Germany: Lingen a/d Ems, Schlachtstr. 12
Source: National Archives, 2.04.58, inv. 130 and others
More information also on http://www.dokin.nl/deceased-children/heinz-hieronymus-hanauer-born-26-may-1925