(2) Any eldest son who can worship the ancestor is called a big one; The eldest son's mother brother and common mother brother are small clans; There is relativity between large and small cases. Emperor, vassal, doctor, scholar, etc.
(3) to ensure the status of the bulk, and to implement the system of direct eldest son inheritance.
(4) Patriarchal clan system ensures the political monopoly and privileged position of the nobility, and is also conducive to the stability and unity within the ruling group.