Klaas Dekker was born 20 January 1802 in Westwoud, North Holland, Netherlands to Arien Dekker (1773-1810) and Marie Laan (1773-1802) and died 15 December 1873 Blokker, North Holland, Netherlands of unspecified causes. He married Trijntje Koopman (1802-1875) 9 April 1826 in Blokker, North Holland, Netherlands.
|Offspring of Trijntje Koopman and Klaas Dekker (1802-1873)|
|Maartje Dekker (c1827-)|
|Arien Dekker (c1829-)|
|Dieuwertje Dekker (c1828-)|
|Geertje Dekker (c1830-1853)|
|Antje Dekker (1831-1903)||7 January 1831 Blokker, North Holland, Netherlands||28 November 1903 Westwoud, North Holland, Netherlands||Jan de Boer (1833-1880)|
|Cornelis Dekker (c1841-)|