Theunis Jelles Tigchelaar, born in Midlum on November 26, 1831, son of Jelle Theunis Tigchelaar (kilnman, tilebaker, worker, tilebaker and tigchelaarsknecht) and Johanna Jans Oosterhout (werkbode), worker.

Theunis was married in Barradeel on May 26, 1860, at the age of 28 to
Dieuwke Berends Faber (aged approximately 28 years), born in Franeker circa 1832, daughter of Berend Sybes Faber and Taekje Dirks Kolthof.

• 1 : Johanna Theunis Tigchelaar, born in Pietersbierum on September 12, 1861.
  

• 2 : Johanna Theunis Tigchelaar, born in Pietersbierum on February 7, 1863.
  

• 3 : Taekje Theunis Tigchelaar, born in Pietersbierum on February 22, 1864.
  

• 4 : Jelle Theunis Tigchelaar, born in Pietersbierum on August 24, 1865.
  

• 5 : Berend Theunis Tigchelaar, born in Pietersbierum on June 17, 1867.
  

• 6 : Pietje Theunis Tigchelaar, born in Pietersbierum on November 12, 1868.
  

• 7 : Pietje Theunis Tigchelaar, born in Pietersbierum on March 19, 1870.
  

• 8 : Jeltje Tigchelaar, born in Pietersbierum on April 24, 1875.