Sybrand Zwaal, born circa 1805 (?), carpenter.

Sybrand was married to
Antje Gijsberts de Boer, born circa 1809 (?), died before September 22, 1853, aged at most 44 years.

• 1 : Henderika Zwaal, born in Harlingen on November 3, 1832, died there on May 24, 1863, aged 30 years.
  Henderika was married in Harlingen on September 22, 1853, at the age of 20 to Heert Meintes Tigchelaar (aged 24 years), born in Harlingen on April 1, 1829, son of Meinte Heerts Tichelaar (carpenter, timmermansknegt, huistimmerman, meester timmerman and huistimmerknecht) and Mettje Johannes Godthelp (grocer), watchmaker, beambte bij de Staatsspoorwegen and watchmaker, died in Harlingen on December 13, 1893, aged 64 years.
  Heert was married afterwards in Harlingen on October 1, 1863, at the age of 34 to Catharina Goverts (aged 22 years), born in Harlingen on January 19, 1841, daughter of Lolle Sytses Goverts (shopkeeper) and Yttje Holles de Jong. Catharina was widow of N.N., born circa 1835 (?).