Sibrigje Rinnerts Zijlstra, born circa 1803 (?), died before February 12, 1852, aged at most 49 years.

Sibrigje was married to
Jacob Roelofs de Boer, born circa 1784, died before February 12, 1852, aged at most 68 years.

• 1 : Rinnert de Boer, born in Harlingen on March 29, 1826, died there on July 12, 1908, buried there, aged 82 years.
  Rinnert was married in Harlingen on February 12, 1852, at the age of 25 (1) to Antje Eeltjes Tichelaar (aged 28 years), born in Harlingen on April 19, 1823, daughter of Eeltje Cornelis Tichelaar (cooper and meester kuiper) and Feijkje Tjamkes Blombergen, died in Harlingen on October 10, 1855, aged 32 years.
  Rinnert was married in Harlingen on May 14, 1857, at the age of 31 (2) to his sister in law Tjamkje Eeltjes Tichelaar (aged 39 years), born in Harlingen on December 2, 1817, daughter of Eeltje Cornelis Tichelaar (cooper and meester kuiper) and Feijkje Tjamkes Blombergen, died in Harlingen on June 4, 1901, buried there, aged 83 years.