He is married to Johanna de Fouw.
Permission for the marriage has been obtained in Kruiningen on September 13, 1799.Source 1
They got married on October 2, 1799 at Kruiningen.Source 11402. Otr. 13 september, Tr. hier 2 oktober, Willem Jacobusz. Rademaker, gebooren en woonende te Cortgene, met Johanna de Fouw, wed. van Leendert van den Ende, gebooren en woonende te Kruiningen.
Kruiningen index ref. trouwen 1671-1810 https://geneaknowhow.net/script/zee/Trouwen%20Kruiningen%201671-1810.pdf