Tjerk Jans, born circa 1747 (?).

Tjerk was married to
Antie Klaases, born circa 1751 (?).

• 1 : Grietje Tjerks, born before October 19, 1756, christened in Harlingen on October 19, 1756.
  Grietje was married in Harlingen on October 10, 1779 in church, at the age of at least 22 to Pieter Baukes (aged 28 years), christened in Eernewoude on May 27, 1751, son of Bauke Halbes and Sytske Baukes.
  

• 2 : Tjerk Tjerks, born in Harlingen before May 27, 1764, christened there on May 27, 1764.
  

• 3 : Antie Tjerks, born in Harlingen before July 13, 1766, christened there on July 13, 1766.
  

• 4 : Claas Tjerks, born in Harlingen before March 29, 1768, christened there on March 29, 1768.
  

• 5 : Jan Tjerks, born in Harlingen before November 21, 1769, christened there on November 21, 1769.
  

• 6 : Klaas Tjerks, born in Harlingen on November 5, 1774, christened there on November 29, 1774.