Sjoerdtje married Gaele Gaeles Posthuma on 13 Mar 1834 in Achtkarspelen, FR, NLD. Gaele (son of Gaele Gaeles Posthuma and Grietje Jacobs Schaafsma) was born about 1809 in Driesum, FR, NLD. [Group Sheet] [Family Chart]

Sjoerdtje married Johannes Harmens Merkus on 20 May 1847 in Achtkarspelen, FR, NLD. Johannes (son of Harmen Jelles Merkus and Lijsbert Jans) was born on 26 May 1810 in Oudwoude, Kollumerland, FR, NLD; died on 30 Jun 1862 in Buitenpost, Achtkarspelen, FR, NLD. [Group Sheet] [Family Chart]