Klaas Klases Postma, born on December 18, 1783, christened in Sint Jacobiparochie on January 25, 1784, son of Klaas Klazes Postma and Aagjen Arjens.

Klaas was married in Eernewoude on March 30, 1807 in church, at the age of 23 to
Tjitske Baukes Zeilstra (aged 22 years), born in Galamadammen on February 19, 1785, christened in Eernewoude on March 27, 1785, daughter of Bauke Pieters Zeilstra and Geertje Johannes.

• 1 : Grietje Klazes Postma, born in Eernewoude on January 27, 1808, christened in Garijp on February 7, 1808.
  

• 2 : Bauke Klazes Postma, born in Eernewoude on August 15, 1809, christened in Garijp on September 3, 1809.
  

• 3 : Klaas Klazes Postma, born in Leidsendam on July 5, 1812, died in Bergum on October 10, 1813, aged 1 year.
  

• 4 : Klaas Klazes Postma, born in Rauwerderhem on January 3, 1818.
  

• 5 : Pieter Klazes Postma, born in Wymbritseradeel on October 28, 1823.
  

• 6 : Johannes Klazes Postma, born in May 1825, died in Stavoren on September 17, 1825, aged 4 months.