Children |
| 1. Minke Jelles Koopmans, b. 25 Feb 1871, Oldeboorn, FR, NLD |
| 2. Ruurd Jelles Koopmans, b. 06 Mar 1873, Opsterland, FR, NLD d. 18 Aug 1885, Utingeradeel, FR, NLD (Age 12 years) |
| 3. Klaas Jelles Koopmans, b. 10 Sep 1875, Opsterland, FR, NLD d. Bef 1879 (Age < 3 years) |
| 4. Klaske Jelles Koopmans, b. 30 Sep 1877, Utingeradeel, FR, NLD |
| 5. Klaas Jelles Koopmans, b. 18 Oct 1879, Utingeradeel, FR, NLD |
| 6. Johannes Jelles Koopmans, b. 29 Jan 1882, Utingeradeel, FR, NLD |
| 7. Dettje Jelles Koopmans, b. 25 Feb 1885, Oldeboorn, FR, NLD d. 25 Mar 1920, Utingeradeel, FR, NLD (Age 35 years) |
| 8. Ruurd Jelles Koopmans, b. 03 Jun 1888, Utingeradeel, FR, NLD d. 02 Mar 1901, Utingeradeel, FR, NLD (Age 12 years) |
| 9. IJde Jelles Koopmans, b. 21 Jan 1891, Utingeradeel, FR, NLD d. 16 Oct 1912, Utingeradeel, FR, NLD (Age 21 years) |
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