Johannes married Antje Minderts Mulder on 25 Jun 1837 in Utingeradeel, FR, NLD. Antje (daughter of Mindert Sijbrens Mulder and Rinske Kornelis de Groot) was born on 20 Nov 1814 in Oldeboorn, FR, NLD. [Group Sheet] [Family Chart]

1. Rinske Johannes Kooistra was born on 27 Nov 1838 in Oldeboorn, FR, NLD; died on 07 Mar 1908 in Smallingerland, FR, NLD.
2. Susanna Johannes Kooistra was born on 25 Oct 1840 in Utingeradeel, FR, NLD; died on 09 Nov 1867 in Idaarderadeel, FR, NLD.
3. Minke Johannes Kooistra was born on 09 Jan 1843 in Joure, Haskerland, FR, NLD; died on 06 Aug 1930 in Tietjerksteradeel, FR, NLD.
4. Gosse Johannes Kooistra was born on 04 Nov 1844 in Oldeboorn, FR, NLD; died on 16 Mar 1917 in Leeuwarden, FR, NLD.
5. Geertje Johannes Kooistra was born on 29 May 1847 in Luxwoude, Opsterland, FR, NLD.
6. Mindert Johannes Kooistra was born on 12 Aug 1849 in Utingeradeel, FR, NLD; died on 29 Jun 1874 in Tietjerksteradeel, FR, NLD.
7. Akke Johannes Kooistra was born on 22 Mar 1852 in Haskerland, FR, NLD; died on 03 Aug 1857 in Tietjerksteradeel, FR, NLD.
8. Antje Johannes Kooistra was born on 22 Mar 1856 in Tietjerksteradeel, FR, NLD; died on 18 Aug 1857 in Tietjerksteradeel, FR, NLD.
9. Teije Johannes Kooistra was born on 25 Jun 1859 in Garijp, Tietjerksteradeel, FR, NLD.

Gosse married Saske Teijes de Jong. [Group Sheet] [Family Chart]