He is married to Theodora van Heeckeren.
They got married
Child(ren):
Bron:
Nederland's patriciaat, Volume 33, Didericus Gijsbertus van Epen, Centraal bureau voor genealogie en heraldick., 1947, Pag. 78
https://books.google.nl/books?id=-OJpAAAAMAAJ&q=Wolter+van+der+Horst+Theodora+van+Heeckeren&dq=Wolter+van+der+Horst+Theodora+van+Heeckeren&hl=nl&sa=X&ved=0ahUKEwiI9LCs_eHcAhVSblAKHT0pCE8Q6AEIJzAA
The data shown has no sources.