Mietje Ruben Vorst was the daughter of Ruben Izak Vorst and Roosje Goldsmit
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Mietje Vorst was the widow of Salomon Grootkerk since 2 November 1929. She lived at the Amsterdamse Straatweg 561B in Utrecht.
Amsterdam municipal archive, Records Jokos, Möbel-claim 16626, statement of the right to inheritance d.d. 12-6-1959 ; property Joods Maatschappelijk Werk