Telling Van to stop his affair with Ada, Demon Veen (in VN’s novel Ada, 1969, Van’s and Ada’s father) says that he believes in Van and his common sense:
Demon regained his composure (if not his young looks) and said:
‘I believe in you and your common sense. You must not allow an old debaucher to disown an only son. If you love her, you wish her to be happy, and she will not be as happy as she could be once you gave her up. You may go. Tell her to come here on your way down.’