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There are two very simply ( Patterns of Descent, Social Structures, Extended Descent ) found in the world's cultures, they differ on principles for defining one's relatives and ancestors. ( Bilateral Descent, Unilineal Descent, Matrilineal Descent, Patrilineal Descent ) is one that operates mainly in North American, it is descent that is passed down through both parents. Every generation you double the amount of ancestors you have. The other one is ( Unilineal Descent, Bilateral Descent ), which operates in around 60%~ of cultures, it is the idea of either ( Matrilineal, Patrilineal ) (mother) or ( Patrilineal, Matrilineal ) (father) being traced only through one parent.