Klaasje Bonk, born in Harlingen on January 3, 1864, daughter of Harmanus Bonk and Elisabeth Bakker.

Klaasje was married in Harlingen on October 18, 1883, at the age of 19 to
Hendrik Tichelaar (aged 20 years), born in Harlingen on November 13, 1862, son of Hendrik Meintes Tichelaar (carpenter) and Maria Abes van Slooten, merchant, workman and postman.

• 1 : Hermanus Tichelaar, born in Harlingen on September 17, 1884, died there on November 9, 1887, aged 3 years.
  

• 2 : Meinte Tichelaar, born in Harlingen on March 30, 1887, boilermaker and leerling machinist.
  Meinte was married in Harlingen on November 29, 1917, at the age of 30 to Romkje de Bruin (aged approximately 24 years), born in Harlingen circa 1893, daughter of Pieter de Bruin (bargeman) and Geertruida Vlieger.
  

• 3 : Hermanus Tichelaar, born in Harlingen on August 22, 1890, boilermaker and ondermachinist.
  Hermanus was married in Harlingen on January 24, 1921, at the age of 30 to Maria Catharina de Vries (aged approximately 24 years), born in Harlingen circa 1897, daughter of Bonifacius de Vries and Grietje Smids (koffiehuishoudster).
  

• 4 : Elisabeth Juliana Tichelaar, born in Harlingen on August 14, 1893.
  Elisabeth was married to Pier Bouma, born in Lollum circa 1892, son of Jan Bouma (conducteur bij de brievenmolen) and Geertje Hania, clerk.
  

• 5 : Hendrik Tichelaar, born in Harlingen on October 26, 1895, died there on November 22, 1895, aged 27 days.
  

• 6 : Stillborn son, born in Harlingen on June 10, 1899.