Has two sons; Thomas Pieter Achilles Claus (b. 1963) from his marriage
with Elly Claus, and Arthur Kristel (b. 1975) from his relationship with Sylvia Kristel.
[magazine interview in the 1990s] I am a person who is unhappy with things as they stand. We cannot accept the world as it is. Each day we should wake up foaming at the mouth because of the injustice of things.