The Houses
From RocksfallWiki
There are six houses: Bear, Lizard, Ox, Wolf, Owl, Cat, and newly revealed Rat. People are born into a House, and are expected to marry someone from that same House. Each House, however, is composed of many tens of thousands of people, and members of all Houses can be found at all ranks of society. Each House has its own noble families, knights, counts, and dukes, but also its own peasants.