| Generation 1 - Hildegondis Anna Grol: Born - Sunday 15 October 1848 - Oude Pekela, Groningen, Nederland |
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| Generation 1 - Hildegondis Anna Grol: Died - Thursday 22 July 1920 - Rotterdam, Zuid-Holland, Nederland |
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| Generation 1 - Hildegondis Anna Grol & Henderikus Bernardus Wortelboer: Married - Thursday 15 January 1874 - Oude Pekela, Groningen, Nederland |
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| Generation 2 - Cornelius Cornelis Grol: Born - Monday 02 January 1809 - Oude Pekela, Groningen, Nederland |
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| Generation 2 - Cornelius Cornelis Grol: Baptised - Tuesday 03 January 1809 - Oude Pekela, Groningen, Nederland |
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| Generation 2 - Cornelius Cornelis Grol: Died - Saturday 26 February 1870 - Oude Pekela, Groningen, Nederland |
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| Generation 2 - Cornelius Cornelis Grol & Johanna Pieters Ei: Married - Tuesday 20 December 1836 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 2 - Johanna Pieters Ei: Born - Monday 13 September 1813 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 2 - Johanna Pieters Ei: Died - Tuesday 30 July 1895 - Oude Pekela, Groningen, Nederland |
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| Generation 3 - Cornelius Willems Grol: Born - 1758 - Veendam, Groningen, Nederland |
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| Generation 3 - Cornelius Willems Grol: Baptised - Sunday 19 February 1758 - Onstwedde, Groningen, Nederland |
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| Generation 3 - Cornelius Willems Grol: Died - Wednesday 23 November 1808 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Cornelius Willems Grol & Hillechien Engberts Holtman: Married - Tuesday 28 October 1788 - Oude Pekela, Groningen, Nederland |
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| Generation 3 - Hillechien Engberts Holtman: Born - Saturday 29 June 1765 - Kleinemeer, Sappemeer, Groningen, Nederland |
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| Generation 3 - Hillechien Engberts Holtman: Died - Friday 14 September 1827 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Petrus Willems Eij: Born - 1766 - Obernüst, Hessen, Deutschland |
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| Generation 3 - Petrus Willems Eij: Died - Monday 15 December 1845 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 3 - Petrus Willems Eij & Janna Everts Meijer: Married - Friday 02 February 1798 - Oude Pekela, Groningen, Nederland |
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| Generation 3 - Janna Everts Meijer: Died - Thursday 29 June 1843 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Willem Cornelis Grol: Born - 1722 - Onstwedde, Groningen, Nederland |
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| Generation 4 - Willem Cornelis Grol: Baptised - Friday 20 February 1722 - Onstwedde, Groningen, Nederland |
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| Generation 4 - Willem Cornelis Grol: Died - Thursday 26 June 1788 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Willem Cornelis Grol & Elizabeth Hindriks Wubbeling Vlas: Married - 1749 - Onstwedde, Groningen, Nederland |
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| Generation 4 - Elizabeth Hindriks Wubbeling Vlas: Born - Estimated in 1725 - Nieuwe Pekela, Groningen, Nederland |
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| Generation 4 - Elizabeth Hindriks Wubbeling Vlas: Died - Thursday 18 July 1805 - Nieuwe Pekela, Groningen, Nederland |
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