Jantje Jentjes Bijlsma, born circa 1818 (?).

Jantje was married to
Hein Ypkes Posthumus, born circa 1814 (?).

• 1 : Trijntje Posthumus, born in Barradeel on May 8, 1841, died there on September 28, 1889, aged 48 years.
  Trijntje was married in Barradeel on May 20, 1865, at the age of 24 to Dirk Jager (aged 29 years), born in Barradeel on October 1, 1835, worker, died in Barradeel on January 13, 1919, aged 83 years.