This is the first French-Dutch co-production.
A special agreement at departmental level had first to be signed before it was even possible to make this first(!) Franco-Dutch co-production.
Practically the entire story is set and filmed in Senlis, just north of Paris.
Bloedverwanten (1977) was only the second time Eddie Constantine acted under a Dutch director. The first time was Geen paniek (1973).
Sophie Deschamps's debut.