He is married to Johanna van Doesselaar.
Permission for the marriage has been obtained in Terneuzen on March 23, 1726.Source 1
They got married on April 14, 1726 at Terneuzen.Source 11726-03-23 Pieter de Coster, j.m. van Neusen en Johanna van Doesselaer, wed. van Adriaan Verniest. (14 april)
Ref. trouwboek Terneuzen (Neusen) 1631-1697 http://www.geneaknowhow.net/script/dewit/terneuzen-ref-trouwen-1631-1697.htm en Index ref. trouwboek Terneuzen (Neusen) 1697-1796 http://www.geneaknowhow.net/script/dewit/terneuzen-ref-trouwen-1697-1796.htm