A tree with no roots

From an al-Reuters story about the recent incest case in Austria: "I had to scribble the family tree on a piece of paper to stop me from getting muddled up; not only was Josef Fritzl the father and grandfather of his children, but his daughter Elisabeth Fritzl was also her children's sister."

Rico says life imprisonment is probably what Fritzl will get, given the Austrian penal code, but drawing and quartering seems more appropriate, somehow...