| Generation 1 - Tomas Harmannus Themmen: Born - Friday 18 March 1825 - Meeden, Groningen, Nederland |
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| Generation 1 - Tomas Harmannus Themmen: Died - Friday 27 April 1860 - Musselkanaal, Onstwedde, Groningen, Nederland |
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| Generation 1 - Tomas Harmannus Themmen & Anna Maagd: Married - Thursday 09 June 1853 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 2 - Hendrik Themmen: Born - 1773 - Meeden, Groningen, Nederland |
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| Generation 2 - Hendrik Themmen: Baptised - Saturday 07 August 1773 - Kleinemeer, Sappemeer, Groningen, Nederland |
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| Generation 2 - Hendrik Themmen: Died - Friday 20 November 1857 - Stadskanaal, Groningen, Nederland |
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| Generation 2 - Hendrik Themmen & Lucretia Jans Nagel: Married - Wednesday 06 August 1800 - Veendam, Groningen, Nederland |
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| Generation 2 - Lucretia Jans Nagel: Born - 1778 - Borgercompagnie, Veendam, Groningen, Nederland |
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| Generation 2 - Lucretia Jans Nagel: Baptised - Tuesday 25 August 1778 - Kleinemeer, Sappemeer, Groningen, Nederland |
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| Generation 2 - Lucretia Jans Nagel: Died - Sunday 04 January 1852 - Meeden, Groningen, Nederland |
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| Generation 3 - Temme Harms Oosterman & Lupke Ottes: Married - Wednesday 19 November 1766 - Kleinemeer, Sappemeer, Groningen, Nederland |
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| Generation 3 - Jans Harms Nagel: Born - 1749 - Veendam, Groningen, Nederland |
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| Generation 3 - Jans Harms Nagel: Baptised - May 1749 - Veendam, Groningen, Nederland |
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| Generation 3 - Jans Harms Nagel: Died - Friday 30 January 1801 - Veendam, Groningen, Nederland |
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| Generation 3 - Jans Harms Nagel & Jantje Geerts Kramer: Married - 1772 - Kleinemeer, Sappemeer, Groningen, Nederland |
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| Generation 3 - Jantje Geerts Kramer: Born - 1748 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Jantje Geerts Kramer: Baptised - Sunday 28 September 1749 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Jantje Geerts Kramer: Died - Sunday 14 November 1830 - Veendam, Groningen, Nederland |
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| Generation 4 - Harm Hindriks Oosterman: Born - Estimated in 1710 - Meeden, Groningen, Nederland |
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| Generation 4 - Harm Hindriks Oosterman & Lizebeth Harms: Married - Saturday 05 December 1750 - Meeden, Groningen, Nederland |
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| Generation 4 - Lizebeth Harms: Born - Estimated in 1720 - Meeden, Groningen, Nederland |
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| Generation 4 - Otto Berends & Grietje Lamberts Gort: Married - 1743 - Veendam, Groningen, Nederland |
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