| Generation 1 - Johannes Hindriks van der Kooi: Born - Sunday 14 February 1909 - Adorp, Groningen, Nederland |
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| Generation 2 - Wietze van der Kooi: Born - Friday 01 September 1876 - Grootegast, Groningen, Nederland |
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| Generation 2 - Wietze van der Kooi: Died - Monday 01 December 1958 - Groningen, Groningen, Nederland |
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| Generation 2 - Wietze van der Kooi & Trientje Zwartenkot: Married - Thursday 19 May 1904 - Zuidhorn, Groningen, Nederland |
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| Generation 2 - Trientje Zwartenkot: Born - Tuesday 08 March 1881 - Grootegast, Groningen, Nederland |
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| Generation 2 - Trientje Zwartenkot: Died - Wednesday 24 March 1943 - Groningen, Groningen, Nederland |
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| Generation 3 - Johannes van der Kooi: Born - Friday 11 January 1839 - Dantumawoude, Dantumadeel, Friesland, Nederland |
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| Generation 3 - Johannes van der Kooi: Died - Monday 23 June 1930 - Onderdendam, Bedum, Groningen, Nederland |
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| Generation 3 - Johannes van der Kooi & Bouktje Zuidema: Married - Saturday 06 May 1876 - Zuidhorn, Groningen, Nederland |
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| Generation 3 - Bouktje Zuidema: Born - Tuesday 01 May 1849 - Oostwold, Leek, Groningen, Nederland |
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| Generation 3 - Bouktje Zuidema: Died - Wednesday 11 February 1931 - Onderdendam, Bedum, Groningen, Nederland |
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| Generation 4 - Ite Ekkes Zuidema: Born - Friday 15 January 1802 - Zuidhorn, Groningen, Nederland |
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| Generation 4 - Ite Ekkes Zuidema: Died - Saturday 09 February 1861 - Leek, Groningen, Nederland |
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| Generation 4 - Ite Ekkes Zuidema & Hilje Gerrits Datema: Married - Saturday 30 January 1836 - Aduard, Groningen, Nederland |
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| Generation 4 - Hilje Gerrits Datema: Born - Sunday 24 July 1808 - Hoogemeeden, Aduard, Groningen, Nederland |
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| Generation 4 - Hilje Gerrits Datema: Baptised - Sunday 31 July 1808 - Oostwold, Midwolda, Groningen, Nederland |
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| Generation 4 - Hilje Gerrits Datema: Died - Wednesday 18 December 1878 - Den Horn, Aduard, Groningen, Nederland |
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