The hereditary system of the Yuułuʔiłʔatḥ originates from a congregation of 17 Ucluelet tribes, which each had a Ha'wilth (Chief) and associated Ha'houlthee.
For people interested in a more-in-depth understanding of traditional Yuułuʔiłʔatḥ governance system, Dr. Michelle Corfield, published an excellent M.A. thesis on the topic in 2002.