| Generation 1 - Detmer Dethmers: Born - Sunday 17 October 1847 - Oude Pekela, Groningen, Nederland |
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| Generation 1 - Detmer Dethmers: Died - Thursday 19 October 1911 - Oude Pekela, Groningen, Nederland |
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| Generation 1 - Detmer Dethmers & Geertje Jansen: Married - Thursday 01 July 1886 - Oude Pekela, Groningen, Nederland |
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| Generation 2 - Waldrik Jans Dethmers: Born - Saturday 11 April 1818 - Termunten, Groningen, Nederland |
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| Generation 2 - Waldrik Jans Dethmers & Hensina de Grooth: Married - Tuesday 29 August 1843 - Oude Pekela, Groningen, Nederland |
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| Generation 2 - Hensina de Grooth: Born - Friday 12 January 1816 - Oude Pekela, Groningen, Nederland |
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| Generation 2 - Hensina de Grooth: Died - Friday 20 May 1892 - Oude Pekela, Groningen, Nederland |
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| Generation 3 - Albert Egberts de Groot: Born - Saturday 24 November 1792 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Albert Egberts de Groot: Baptised - Sunday 02 December 1792 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Albert Egberts de Groot & Maria Hensens Gesterkamp: Married - Monday 23 March 1812 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Maria Hensens Gesterkamp: Born - Thursday 24 March 1791 - Oude Pekela, Groningen, Nederland |
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| Generation 3 - Maria Hensens Gesterkamp: Baptised - Friday 25 March 1791 - Oude Pekela, Groningen, Nederland |
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| Generation 3 - Maria Hensens Gesterkamp: Died - Friday 20 April 1855 - Oude Pekela, Groningen, Nederland |
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| Generation 4 - Egbert Derks de Grood: Born - 1741 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Egbert Derks de Grood: Baptised - Sunday 14 May 1741 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Egbert Derks de Grood & Grietijn Alberts Schrik: Married - Sunday 31 January 1790 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Grietijn Alberts Schrik: Born - Thursday 08 May 1760 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Grietijn Alberts Schrik: Baptised - Sunday 11 May 1760 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Grietijn Alberts Schrik: Died - Wednesday 24 July 1822 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Grietje Wiltes Kok: Died - Sunday 27 May 1832 - Oude Pekela, Groningen, Nederland |
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