Eliazer Swaan was the son of Sara Swaan-Koekoek and Barent Swaan, who died in 1923. Eliazer was unmarried.
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In addition, a Jokos file (number 52518) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 11760/9923).