Klaas married Jantje Rommerts Brandsma on 03 May 1828 in Kuinre, OV, NLD. Jantje (daughter of Rommert Wijbes Brandsma and Piertjen Jans) was born about 1807; died on 12 Jul 1842 in Lemsterland, FR, NLD. [Group Sheet] [Family Chart]

1. Jan Klazes Steenbeek was born in 1829 in Blankenham, OV, NLD.
2. Rommert Klazes Steenbeek was born in 1831 in Oosterzee, Lemsterland, FR, NLD; died on 16 Jun 1902 in Utingeradeel, FR, NLD.
3. Jetske Klazes Steenbeek was born in 1834 in Oosterzee, Lemsterland, FR, NLD.
4. Wiebe Klazes Steenbeek was born in 1836 in Oosterzee, Lemsterland, FR, NLD.
5. Piertje Klazes Steenbeek was born in 1838 in Oosterzee, Lemsterland, FR, NLD.
6. Aafjen Klazes Steenbeek was born in 1841 in Oosterzee, Lemsterland, FR, NLD; died on 23 Feb 1895 in Tietjerksteradeel, FR, NLD.

Klaas married Dirkje Jacobs Katsma on 25 Dec 1844 in Lemsterland, FR, NLD. Dirkje (daughter of Jacob Sijbes Katsma and Lutske Lourens de Rook) was born on 20 Mar 1823 in Oosterzee, Lemsterland, FR, NLD; died on 06 Sep 1852 in huis 135, Oldeboorn, FR, NLD. [Group Sheet] [Family Chart]

1. Jacob Klazes Steenbeek was born on 24 Sep 1845 in Oosterzee, Lemsterland, FR, NLD.
2. Lutske Klazes Steenbeek was born in 1846 in Oosterzee, Lemsterland, FR, NLD; died on 11 Jan 1905 in Tjalleberd, Aengwirden, FR, NLD.

Jan married Jetske Geerts Tip. [Group Sheet] [Family Chart]