Sientje Grootkerk was the daughter of Isaac Grootkerk and Rebecca de Jong. She was first married to Meijer van West, with whom she had nine children. After he died in 1922 she was married to Arend van der Kar, from who she had one more child. Two children had died before the war and two other children survived the war.
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See also: I. Lipschits, Onbestelbaar. Herinneringen in briefvorm (The Hague 1992) 59