Answer :
This process here is known as segmentary opposition. It is a component of segmentary lineage.
What is segmentary lineage?
Equivalent components (or "segments") of a segmentary lineage society are bound together by common values. An example of a tribal civilization is one with segmented lineages.
A close family is typically the smallest and closest group and will stand together.
They then comprise larger segments that share similar traits. In the event of a dispute between brothers, all of the brothers will decide who will win, and cousins will not choose a side.
Brothers on one side will align against brothers on the other side if the fight is between cousins.
However, if a member of a tribe and a non-member are at odds, the entire tribe—including distant cousins—might mobilize against the foreigner and his or her allies.
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