Isaäc Gerritse was the son of Jacob Gerritse and Marianna Lootsteen. He married Marianne de Klijn in Amsterdam in 1907. She was the daughter of Nathan de Klijn and Mietje Visser. The couple had six children: Marie, Sophia, Nathan, Jacob, Rebecca and one child that survived the war.
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According to a list with shops of Jewish owners, compiled by the Amsterdam pol…