(1) He is married to Barbara Sterck.
They got married
(2) He is married to Machtelt Stockmans.
Permission for the marriage has been obtained in Hontenisse on April 1, 1679.Source 1
datum: 1 apr 1679; naam bruidegom: Marcus de Keijser; weduwnaar van: Barbara Stercks; naam bruid: Machtelt Stockmans; weduwe van: Pieter Doms; scan: 5; link naar scan: https://www.familysearch.org/ark:/61903/3:1:3QS7-89QJ-345L?i=120&cc=2036997