Berendtje Ruurds Knijpstra, born circa 1827 (?).

Berendtje was married to
Jan Boukes Elzinga, born circa 1819, died before May 11, 1876, aged at most 57 years.

• 1 : Ruurd Jans Elzinga, born in Wartena on January 24, 1850, worker, died in Wartena on July 5, 1927, aged 77 years.
  Ruurd was married in Idaarderadeel on May 11, 1876, at the age of 26 (1) to Antje Halbes Feenstra (aged 23 years), born in Wartena on October 9, 1852, daughter of Halbe Wybes Feenstra (shoemaker) and Aurelia Rienks van Keimpema, died in Wartena on June 7, 1877, aged 24 years.
  Ruurd was married in Idaarderadeel on July 3, 1886, at the age of 36 (2) to Kunne Gosses Hiemstra (aged 30 years), born in Tietjerk on November 10, 1855, daughter of Gosse Sijtzes Hiemstra (worker) and Stijntje Pieters de Bruin, maid servant.