The extinction of Jiuzu started from that dynasty.

The killing of nine clans should come from the law of foreign three clans after Qin reform. That is, it began in the Qin dynasty.

"Jiuzu" also refers to relatives. However, "nine schools" refer to different theories. It is said that grandfather's uncle went to his great-grandson, namely, great-grandson, great-grandson (the eighth grandson was called great-grandson in ancient times), son, body, father, grandfather, great-grandfather, great-grandfather; First of all, it has four paternal families, three matriarchal families and two wife families. Patriarchal family refers to an aunt's son (aunt's child), a sister's son (nephew), a daughter's son (grandson) and his own kin (parents, brothers, sisters and children); The matriarchal clan refers to the mother's father (grandfather), mother (grandmother) and subordinate mother (uncle); In-laws refer to parents-in-law.

The emergence of the theory of "Nine Clans" has a great relationship with the criminal law system in ancient society. Ancient society practiced cruel laws that implicated others. If a person breaks the law, especially Dafa, then the "nine families" will often be destroyed, that is, "involving nine families." With the changes of the times, the meaning of "Jiuzu" has changed a lot today, and the meaning of their relatives has faded out and become the general name of all people related to it.