Theodorus Ypma, born circa 1820 (?).

Theodorus was married to
Stientje Canter Visser, born circa 1824 (?).

• 1 : Grietje Ypma, born in Franeker on January 17, 1847.
  Grietje was married in Utingeradeel on March 7, 1869, at the age of 22 to Auke Atzes van der Ploeg (aged 24 years), born in Akkrum on April 29, 1844, son of Atze Aukes van der Ploeg (carpenter's man) and Jitske Wybes Feenstra (maid servant).