Marytje Van Blarcom was baptized September 29, 1700, daughter of Pieter Janse Van Blarcom and Jacomyntje Cornelis Van Blarcom.

On December 10, 1720, Marytje married David Demerest (also noted as De Maree), son of David Demerest and Antie Sloth Demerest. Marytje and David had four children baptized in Hackensack. Jacomina (1721), David (1723), Antie (1724) and Pieter (1726).

Death and burial records for Marytje Van Blarcom Demerest, daughter of Pieter Janse Van Blarcom, are currently unavailable.