Klaas Allerts Sybrandi, born in Harlingen on June 7, 1811, son of Alle Klazes Sybrandi and Martje Jans Hoekstra, worker and farmhand, died in Leeuwarden on December 13, 1847, aged 36 years.

Klaas was married in Franekeradeel on June 20, 1835, at the age of 24 to
Knelleske Jans Tichelaar (aged 21 years), born in Midlum on January 16, 1814, daughter of Jan Cornelis Tichelaar (tilebaker, fisherman and worker) and Rinske Gerrits Tigchelaar (peat tallier), maid servant, died in Leeuwarden on November 28, 1902, aged 88 years.
Knelleske was married afterwards in Leeuwarden on August 4, 1850, at the age of 36 to Claas Gerlofs Beers (aged approximately 27 years), born circa 1823 (?).

• 1 : Mattje Sibrandi, born in Midlum on May 1, 1836, died in Leeuwarden on November 12, 1887, aged 51 years.
  

• 2 : Jan Sibrandi, born in Midlum on February 2, 1838, died in Leeuwarden on February 25, 1929, aged 91 years.
  

• 3 : Sybren Sibrandi, born in Midlum on January 8, 1840, died in Leeuwarden on December 27, 1908, aged 68 years.
  

• 4 : Rinse Sibrandi, born in Franeker on December 14, 1842, died in Wymbritseradeel on March 10, 1921, aged 78 years.