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Daughter of Jan Willem Koer and Jentjen Boone Sister of Johanna Coer; Derk Koer; Herman Koer; Gerharda Koer; Christina Koer and 4 others; Christiaan Koer; Herman Koer; Christiaan Koer and Derk Koer « less Half sister of Jan Willem Koer and Willemina Coer