Hourglass Chart:
Jan Grondstra

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Tjalling GrondstraMale ‎(I17151)‎
Birth 13 August 1895 -- Woudsend, Wymbritseradiel, Friesland, Netherlands
Death 17 December 1943 (Age 48) -- Wildervank, Veendam, Groningen, Netherlands
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Froni GrondstraFemale ‎(I18706)‎
Death 21 October 2013
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Harmen GrondstraMale ‎(I18699)‎
Birth 12 December 1890 -- Woudsend, Wymbritseradiel, Friesland, Netherlands