Elkan de Magtige was a son of Joseph de Magtige and Saartje de Klijn. He married 7 June 1911 to Hadasse Sanders from Den Haag, a daughter of Jacob Salomon Sanders and Hesje van der Kloot. Togehter they had four children: Jacob, Joseph and Israel. Their son Salomon died in Apeldoorn, 15 years old.
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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.