Gertug Johanna Polak-de Jonge was a daughter of Martha de Jonge-Schreiber.
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Her both children, Johan and Marcel, were deported to Sobibor in June 1943 from Vught via Westerbork on the so-called children's transport. They both died there.
J. de Moei, Joodse kinderen in het kamp Vught (Vught 1999)