On 13 Apr 1783 when Cornelis was 20, he married Christina Demarest, daughter of Johannes Demarest (20 Aug 1720-1 Feb 1783) & Rachel Zabriskie (ca Mar 1725-16 Apr 1813). Born on 28 Feb 1762 in Schraalenburgh, Bergen County, New Jersey. Christina was baptized in Schraalenburgh, Bergen County, New Jersey, on 21 Mar 1762. Christina died on 20 Feb 1822; she was 59.