(1) He is married to Jaquemijna Westveer.
They got married
(2) He is married to Pieternella Wijkaert.
Permission for the marriage has been obtained in Kruiningen on April 19, 1765.Source 1
They got married on May 8, 1765 at Kruiningen.Source 11029. Otr. 19 april, Tr. 8 mei, Jacob Gijssen, wr. van Jaquemina Westveer, wonende te Waarden, en Pieternella Wijkaert, jd. van ‘s Gravenpolder, wonende onder Cruiningen.
Kruiningen index ref. trouwen 1671-1810 https://geneaknowhow.net/script/zee/Trouwen%20Kruiningen%201671-1810.pdf