(1) He is married to (Not public).
They got married
(2) He is married to Maria van Ombergen.
Permission for the marriage has been obtained in Hontenisse on May 18, 1680.Source 1
datum: 18 mei 1680; naam bruidegom: Jan de Coster; weduwnaar van: Maria Domis; naam bruid: Maria van Ombergen; scan: 8; link naar scan: https://www.familysearch.org/ark:/61903/3:1:3QS7-99QJ-342K?i=123&cc=2036997