Diederik Constantijn Baron van Wassenaer (born 1957) (b. 1957) Parents Arent Jacob Otto van Wassenaer van Catwijck Louisa Wiarda Children Julie Elisabeth Bernadette Barones van Wassenaer Duco Arthur Otto Baron van Wassenaer Arent Philip Constantijn Baron van Wassenaer Siblings Alexander Philips Willem Baron van Wassenaer Arent Godfried Jan Baron van Wassenaer Geertruid Meilende Barones van Wassenaer Partners Theresia Maria Westgeest