He is married to Maria de Clerck.
Permission for the marriage has been obtained in Hontenisse on February 17, 1686.Source 1
datum: 17 feb 1686; naam bruidegom: Jan van Goethem; naam bruid: Maria de Clerck; weduwe van: Laureijs Blommaert; scan: 19; link naar scan: https://www.familysearch.org/ark:/61903/3:1:3QSQ-G9QJ-3HM4?i=16&cc=2036997