Children |
| 1. Sijtske Johannes Folkertsma, b. 02 Oct 1892, Marrum, Ferwerderadeel, FR, NLD |
| 2. M.J. Folkertsma |
| 3. P.J. Folkertsma |
| 4. J.J. Folkertsma |
| 5. Wijtze Johannes Folkertsma, b. 25 Jan 1894, Marrum, Ferwerderadeel, FR, NLD |
| 6. Bote Johannes Folkertsma, b. 12 May 1896, Marrum, Ferwerderadeel, FR, NLD |
| 7. Grietje Johannes Folkertsma, b. 19 Apr 1899, Leeuwarden, FR, NLD |
| 8. Hendrikje Johannes Folkertsma, b. 14 Feb 1901, Leeuwarden, FR, NLD d. 27 May 1902, Leeuwarden, FR, NLD (Age 1 year) |
| 9. Pieter Johannes Folkertsma, b. 14 Dec 1902, Leeuwarden, FR, NLD d. 17 Dec 1903, Leeuwarden, FR, NLD (Age 1 year) |
| 10. Hendrikje Johannes Folkertsma, b. 04 Jun 1904, Leeuwarden, FR, NLD |
| 11. Pieter Johannes Folkertsma, b. 05 May 1908, Leeuwarden, FR, NLD d. 17 Jun 1908, Leeuwarden, FR, NLD (Age 0 years) |
| 12. Antje Johannes Folkertsma, b. 26 Jan 1910, Leeuwarden, FR, NLD |
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