Sybren Tjipkes Poog, born in Workum circa 1823, son of Tjipke Douwes Poog and Sjoukjen Sijbrens de Boer (peat tallier), sailor.

Sybren was married in Wymbritseradeel on October 8, 1853, at the age of approximately 30 to
Eike Jelles Bijkerk (aged 31 years), born in Heeg on November 1, 1821, daughter of Jelle Reins Bijkerk (worker, barge hand, farmer's hand and worker) and Geeske Jans Grasman, seamstress, died in Workum on December 15, 1873, aged 52 years.
Eike was married before in Wymbritseradeel on March 16, 1844, at the age of 22 to Tjamke Annes Cnossen (aged 26 years), born in Hommels on April 11, 1817, son of Anne Tjamkes Cnossen (praamskipper, bargeman, worker, worker, farmer's hand, bargeman, bargeman, bargeman and worker) and Anna Catharina Frederika Hoekema (maid servant), barge hand, died in Londen on May 25, 1848, aged 31 years.