Children:
- Sjoerd Tjeerds died before 1772.
- Sjoerd Tjeerds Koster was born on 27 Oct 1772 in Franeker, FR, NLD; died on 30 Nov 1826 in Wijk F, no. 122, Franeker, FR, NLD.
- Geert Tjeerds Koster was born on 08 Jun 1774 in Franeker, FR, NLD.
- Tjamke Tjeerds Koster was born on 29 May 1776 in Franeker, FR, NLD.
- 1. Lieuwe Tjeerds was born on 01 May 1781 in Franeker, FR, NLD; died before 1782.
- Lieuwe Tjeerds Koster was born on 13 Nov 1782 in Franeker, FR, NLD.
- Tamme Tjeerds Koster was born on 22 Oct 1784 in Franeker, FR, NLD.
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