Sara Swaab was a daughter of Meijer Swaab and Raatje Gerritse. She married Elias Koopman in Amsterdam on 20 May 1920, a son of Elizaer Koopman and Mijntje Soep. website www.wiewaswie.nl.
In addition, a Jokos file (number 377) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.