Israel de Magtige married Mietje Blitz in Amsterdam on 18 March 1942, a daughter of Isaac Blitz and Keetje Schoenlapper. City Archive of Amsterdam, archive card of Israel de Magtige and Mietje Blitz.
In addition, a Jokos file (number 20999) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.