He is married to Catharina de Waal.
Permission for the marriage has been obtained in Hontenisse on April 16, 1688.Source 1
datum: 16 apr 1688; naam bruidegom: Joost de Blij; naam bruid: Catharina de Waal; weduwe van: Pieter van Brandegem; scan: 23; link naar scan: https://www.familysearch.org/ark:/61903/3:1:3QS7-89QJ-34TT?i=22&cc=2036997