Isaäc Walvis was a son of Salomon Walvis and Dina Grishaver. He married in Amsterdam on 2 October 1923 to Saartje van West, daughtger of Jacob van West and Betje Schaap.
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A police officer from Amsterdam tried to get Isaäc Walvis out of the Hollandsche Schouwburg with a fake warrant for his arrest. However Isaäc refused to leave without his family.
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