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| | children of Maria Susanna and Jacobus Du Preez | |
| | Elisabeth Du Preez 3 married Charel Johannes Du Plessis 4
 Notes: He bought the farm 'De Twee Jongegezellen' from the estate of his father-in-law, Jan Gysbert Olivier, in 1798.
 (From: The Secluded Valley, by Anna Boeseken and Margaret Cairns, Perskor, Cape Town, 1989. Page 97)
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| Jacobus Lodewyk Du Preez 5 |
| Phillipus Du Preez 6 |
| Pieter Du Preez 7 |
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| | children of Maria Susanna and Jan Gysbert Olivier | |
| | Jan Hendrik Olivier 1753-before 1798 born 1753 baptized 1753, Tulbagh died before April 1798 married Anna Elisabeth Putter 9 1725-circa 1797 |
| Magdalena Martha Olivier born 1756 born 1756 10 baptized 18 January 1756, Tulbagh 11 |
| Hester Beatrix Olivier born 1757 born 1757 12 baptized 7 August 1757, Tulbagh 13 |
| Andries Olivier born 1759 born 1759 14 baptized 20 May 1759, Tulbagh 15 |
| Gijsbert Olivier born & died 1761 born 1761 16 baptized 12 April 1761, Tulbagh 17 died 9 December 1761, Tulbagh 18 |
| Anna Hendrina Olivier born 1762 born 1762 19 baptized 28 November 1762, Tulbagh 20 |
| Maria Aletta Olivier born 1765 born 1765 21 baptized 29 December 1765, Tulbagh 22 |
| Francois Gijsbert Olivier born 1767 born 1767 23 baptized 20 September 1767, Tulbagh 24 |
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