Alexander Velleman and Kaatje Koster married in 1903 in Rotterdam.
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Alexander Velleman and Kaatje Koster had five children. Herman Velleman lived somewhere else and did not survive the war.
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In addition, a Jokos file (number 52010) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.