A Brood is a group that consists of at least three vampires. Broods are not that common as most vampires prefer to travel alone or in pairs, but a few exist stably over long periods of time, even rising to prominence in the vampire world. A Brood is controlled by either a Count, Countess, or even both.
As most vampires drink human blood, they are wilder and bloodthirstier than "vegetarians" and therefore do not usually get along with each other very well. In large broods, members can easily turn on each other for domination of blood and the clan could be split apart by the feuding members. This is mostly common in the southern parts of North America, where groups are formed to battle other broods for territorial means.
There is the occasional mention of "houses" but it remains unclear if a house is synonymous with a Brood or if a Brood can consist of several houses, much like a royal court. What is clear is that the elders sit at the heart of the Brood, their commands either enforced or tempered by the Council, while the Paladins stand guard and wait to do their bidding.
The regent enjoys considerable status but the extent of his political power remains unclear. Since more than one Brood exists, it is possible that the position of regents was conceived to rule the clans while in turn being ruled by the Council.