Esther Muller married for the second time to Barend Dooseman. Esther had a son, Louis, who was mentioned in the testament of Barend. Perhaps Louis van Maarsen, who lived at the same address as Barend and Esther, was that son.
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Barend Dooseman died on 16 June 1941 in Amsterdam. Louis van Maarsen was a son of Esther Dooseman-Muller.
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In addition, a Jokos file (number 51477) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.