I agree with Eboue. It's more like the old Plantagenets than nepotism, really. It wan't just a simple case of son succeeding father, they could only do that because they had the support of the rest of the nobility, who knew that they were actually the maddest bastards around that would outslaughter any fecker else the kingdom could put up anyway, and therefore themselves were the most suitable to be king. Except for the bent one that lost Scotland, of course.