Isodore van Geldere was a son of Saul van Geldere and Sientje Fransman. He was the seventh of the thirteen children in the family and he was born on 31 October 1894 in Doesburg. During his stay in Harlingen, where he arrived from Arnhem as a 16-year old boy, he worked as a baker. He lived in the Scheerstraat 3 in the old centre of the city and on 13 January 1913, Isodore left again for Doesburg.
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