Klaas Jacobsz Brandsen was born 14 October 1775 in Onderdijk, North Holland, Netherlands to Jacob Brandsen (c1738-1808) and Neeltje Hardebil (1742-1808) and died 7 February 1841 Onderdijk, North Holland, Netherlands of unspecified causes. He married Lijsbeth Ruijtenberg (c1780-1842) 7 February 1802 in Wervershoof, North Holland, Netherlands.
|Offspring of Klaas Brandsen and Lijsbeth Ruijtenberg (c1780-1842)|
|Duijfje Brandsen (1803-bef1804)|
|Duijfje Brandsen (1804-)|
|Neltje Brandsen (1807-1895)||8 March 1807 Onderdijk, North Holland, Netherlands||12 February 1895 Nibbixwoud, North Holland, Netherlands||Cornelis Knol (c1801-1838) Cornelis Knol (c1801-1838) Jan Zuiker (1815-1879)|
|Aafje Brandsen (1809-1868)||18 October 1809 Onderdijk, North Holland, Netherlands||2 May 1868 Andijk, North Holland, Netherlands||Klaas Kuin (1795-1858)|
|Jacob Brandsen (1815-)|