Jacobus married Jacoba Van Lantschoot.
They had the following children:
2 F i Catharina Constant was christened on 18 Oct 1629 in Sint Anna Brugge. [Notes] 3 M ii Jacobus Constant was christened on 10 Oct 1632 in Sint Anna Brugge. [Notes] 4 M iii Petrus Constant was christened on 6 Mar 1635 in Sint Anna Brugge. [Notes] + 5 M iv Jacobus Constant was christened on 26 Aug 1640. He died on 12 Jul 1701.