| Generation 1 - Hendrik Gruppen: Born - Tuesday 28 March 1865 - Zuidwolde, Drenthe, Nederland |
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| Generation 1 - Hendrik Gruppen: Died - Sunday 11 January 1953 - Zuidwolde, Drenthe, Nederland |
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| Generation 1 - Hendrik Gruppen & Jantje Drogt: Married - Saturday 27 April 1889 - Zuidwolde, Drenthe, Nederland |
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| Generation 2 - Berend Hendriks Gruppen: Born - Sunday 12 October 1828 - Zuidwolde, Drenthe, Nederland |
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| Generation 2 - Berend Hendriks Gruppen: Died - Thursday 24 March 1892 - Zuidwolde, Drenthe, Nederland |
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| Generation 2 - Berend Hendriks Gruppen & Wilhelmina Boer: Married - Saturday 17 May 1856 - Zuidwolde, Drenthe, Nederland |
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| Generation 2 - Wilhelmina Boer: Born - Monday 14 April 1828 - Hoogeveen, Drenthe, Nederland |
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| Generation 2 - Wilhelmina Boer: Died - Friday 03 February 1882 - Zuidwolde, Drenthe, Nederland |
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| Generation 3 - Hendrik Berends Gruppen: Born - Monday 14 October 1799 - Zuidwolde, Drenthe, Nederland |
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| Generation 3 - Hendrik Berends Gruppen: Died - Friday 28 April 1865 - Zuidwolde, Drenthe, Nederland |
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| Generation 3 - Hendrik Berends Gruppen & Geesje Piest: Married - Saturday 27 October 1827 - Zuidwolde, Drenthe, Nederland |
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| Generation 3 - Geesje Piest: Born - Sunday 26 January 1800 - Havelte, Drenthe, Nederland |
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| Generation 3 - Geesje Piest: Died - Thursday 16 April 1868 - Zuidwolde, Drenthe, Nederland |
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| Generation 4 - Berend Hendriks Gruppen: Born - 1756 - Zuidwolde, Drenthe, Nederland |
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| Generation 4 - Berend Hendriks Gruppen: Died - Friday 06 January 1832 - Zuidwolde, Drenthe, Nederland |
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| Generation 4 - Jentien Hendriks Drogt: Born - Estimated in 1766 - Zuidwolde, Drenthe, Nederland |
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| Generation 4 - Jentien Hendriks Drogt: Died - Tuesday 13 March 1832 - Zuidwolde, Drenthe, Nederland |
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| Generation 4 - Hendrik Jans Piëst: Born - Estimated in 1757 - Havelte, Drenthe, Nederland |
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| Generation 4 - Hendrik Jans Piëst: Died - Tuesday 09 January 1816 - Havelte, Drenthe, Nederland |
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| Generation 4 - Ida Jans Hendriks: Born - Sunday 06 November 1763 - Havelte, Drenthe, Nederland |
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| Generation 4 - Ida Jans Hendriks: Died - Wednesday 30 November 1836 - Havelte, Drenthe, Nederland |
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