Presumable this person is commemorated on a memorial in Vierhouten. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.
In addition, a Jokos file (number 13838) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Joseph Mechanicus was fruitventer. Eerder in zijn werkzame leven was hij sigarenmaker. Zoon Leo was kapper, later leerling perser. Dochter Marianne was kleermaakster, later handwerkster. Leo doet in december 1940 aangifte van fietsdiefstal. Bron: archief Amsterdam.