Descendancy Chart:
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Harmen Grondstra
(I18699) Birth 12 December 1890 -- Woudsend, Wymbritseradiel, Friesland, Netherlands
1
Marriage 20 February 1923 -- Leens, De Marne, Groningen, Netherlands
- Aafke Huizenga
(I18696) Birth 1903 -- Den Hoorn, Leens, Groningen, Netherlands
Number of Children: 8 
1 . 1- Jan Grondstra(I18701)
Private
1 . 2 - Johan Grondstra(I18702)
Private
1 . 3 - Willy Grondstra(I18703)
Private
1 . 4 - Martha Grondstra(I18704)
Private
1 . 5 - Herman Grondstra(I18705)
Private
1 . 6 - Froni Grondstra
(I18706) Death 21 October 2013
1 . 7 - Thomas Grondstra(I18707)
Private
1 . 8
