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9 July 1938
7 December 1942
Reached the age of 4 years
Sonja Kool was a daughter of Aaltje Kool. She had another sister Elly and six half-brothers and half-sisters: Jacob, Elias, Rebecca, Joseph, Elisabeth and Asser Aandagt.
Stadsarchief Amsterdam, archiefkaart Isaac Aandagt.
in October 1940 – December 1940