Sijtske married Kornelis Binnes Fennema, son of Binne Tjipkes Fennema and Aaltje Kornelis Wagenaar, on 21 May 1898 in Bergum (Burgum) Tietjerksteradeel Friesland Netherlands. (Kornelis Binnes Fennema was born on 24 Jun 1870 in Garijp (Garyp) Tietjerksteradeel Friesland Netherlands.)
