I was really hooked throughout the film, the setting, the characters and the pure wickendness of the story is sublime! I am not entirely sure what this film is supposed to say, but for me: No matter how weird you are, you can be a family, related by blood or not... and even if your anchestors or parents did super bad and wicked things, they do not make you a bad person.
Bonus: I really loved the set design of Beelitz Heilstätten, where they shot the main mansion.