Willem Sippes, born in the year 1743, son of Sippe Pieters and Klaaske Willems, died in Pietersbierum in the year 1800, aged 57 years.

Willem was married to
Sytske Lieuwes, born circa 1738, daughter of Lieuwe Brands and Hykje Tjepkes, died in Wijnaldum on December 18, 1819, aged approximately 81 years.

• 1 : Klaaske Willems van der Zee, born in Sexbierum circa 1787, maid servant.
  Klaaske was married in Barradeel on March 1, 1828, at the age of approximately 41 to Broer Hobbes Dijkstra (aged 43 years), born in Zweins on March 13, 1784, christened there on April 25, 1784, son of Hobbe Seerps Dijkstra (arbeider op Kingma) and Antje Broers.
  Broer was married before in Pietersbierum on May 18, 1806 in church, at the age of 22 to Sibbeltje Anes (aged approximately 22 years), born circa 1784 (?), died before 1809, aged at most 25 years. Broer entered a notice of marriage before in Harlingen on April 29, 1809. He was married there on May 14, 1809 in church, at the age of 25 to Jiepke Sjoerds (aged approximately 27 years), born circa 1782 (?), daughter of Sjoerd Harmens and Tietje Pieters, died in Pietersbierum on December 31, 1825, aged approximately 43 years.