Grietje de Jong was a daughter of Gosse Jekoesil and Marianne Miriam Barnstijn. Grietje de Jong grew up in a big family, she had nine brothers and sisters. Her parents died before the war.
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Untill 1930 Grietje de Jong was employed by Jacobus Leefmans and Froukje Moses Zendijk in Leeuwarden.
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