Willem Frederik Katoen, born circa 1834, sailmaker and sailor.

Willem was married to
Dirkje Wietzes Hettema, born circa 1833 (?).

• 1 : Wytske Katoen, born in Harlingen on September 5, 1856.
  

• 2 : Albert Katoen, born in Harlingen on September 17, 1858.
  

• 3 : Trijntje Katoen, born in Harlingen on November 13, 1859, died before January 15, 1867, aged at most 7 years.
  

• 4 : Jan Katoen, born in Harlingen on January 15, 1861.
  

• 5 : Wietse Katoen, born in Harlingen on January 29, 1863, died in Rotterdam on September 9, 1896, aged 33 years.
  Wietse was married in Harlingen on February 27, 1890, at the age of 27 to Aaltje Rienstra (aged 23 years), born in Almenum on June 20, 1866, daughter of Willem Jans Rienstra (worker) and Marijke Willems Alberda, died in Harlingen on August 27, 1952, aged 86 years.
  Aaltje was married afterwards in Harlingen on April 27, 1903, at the age of 36 to Wopke Gerrits Tigchelaar (aged 39 years), born in Midlum on May 9, 1863, son of Gerrit Tigchelaar (worker, tilebaker and tilebaker's hand) and Jetske Folkerts van der Vliet (woman worker), worker, caual labourer and workman, died in Harlingen on June 27, 1939, aged 76 years. Wopke was married before in Franekeradeel on November 15, 1886, at the age of 23 to Aafke Plekker (aged 23 years), born in Franeker on November 7, 1863, daughter of Sibren Feikes Plekker (kilnman) and Aaltje Wytses Zijlstra, maid servant, died in Harlingen on July 22, 1901, aged 37 years.
  

• 6 : Elisabeth Katoen, born in Harlingen on September 27, 1864.
  

• 7 : Trijntje Katoen, born in Harlingen on January 15, 1867.
  

• 8 : Willem Frederik Katoen, born in Harlingen on November 14, 1869.
  

• 9 : Sjoukje Katoen, born in Harlingen on September 18, 1877.