Alle Klazes Sybrandi, born in the year 1770, son of Klaas Sybrandi and Albertje Medendorp, died in Leeuwarderadeel on April 11, 1831, aged 61 years.

Alle was married to
Martje Jans Hoekstra, born circa 1788, daughter of Jan Hoekstra and Maike Hofma, died in Harlingen on January 24, 1826, aged approximately 38 years.

• 1 : Klaas Allerts Sybrandi, born in Harlingen on June 7, 1811, 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 (?).
  

• 2 : Maaike Alles Sybrandy, born in Harlingen on July 7, 1815.
  

• 3 : Sara Albertina Sybrandi, born in Harlingen on June 23, 1821.
  

• 4 : Sybren Alles Sybrandi, born in Harlingen on May 28, 1824.