Abraham Hakker was the son of Jonas Hakker and Henriette Plas. He was married to Esther du bruin in 1909. She was the daughter of Jacob du Bruin and Vrouwtje Stokvis. The couple had two children: Vrouwtje and Jonas.
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In addition, a Jokos file (number 32181) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
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