There is a marriage record of Dirk Kok, age 21, and Grietje de Vries, age 23. Dirk's birthplace listed as Hoogwoud and Grietje's as Wervershoof. The registration date of the marriage was 27 Apr, 1834, in the municipality of Nibbixwoud, Nl. Dirk's father was Jan Kok and mother was Trijntje Helder. Grietje's father was Gerrit de Vries and mother was Maartje Groen. Information from Genlias.nl.