Mietje was the daughter of Levie Joseph de Leeuw (1832-1917) and Regina de Leeuw-de Leeuw (1850-1912). Two of her sisters, Diena and Geertruida, were also killed.
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In addition, a Jokos file (number 9458) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
This family is commemorated on a memorial in Assen. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.