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Types of Kinship and Descent Systems; Its Advantages and Disadvantages

Importance of Kinship system

Kinship System is the biological relationship that determines who one's relatives are and one's relationship with them.  This system is an important part of man's life. Kinship system include people one is related with through descent or marriage. Descent system is one of the terms related to kinship system. Descent bind people of the same lineage together. There are many categories of descent system. They are the Unilineal, Bilateral, Ambilineal, Bilateral or double descent systems. The Unilineal descent system could either be Patrilineal or Matrilineal decent system.

More than one descent systems are practiced in Nigeria. Different cultures have their own way of affiliating themselves to their kinship ties . The interesting thing is that all the types of descent system are being practiced by Nigerians. Despite the differences in kinship ties across the country, they are all similar in their course of tracing connection through the parent-child ties.

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Patrilineal Descent System 
This descent system, also known as the "agnatic" is the most common descent system that traces an individual to the father's side or lineage. Authority and economic survival are vested on the men. The household in this type of society is male-headed which is also known as the patriarchal household. Both the male and the female children belongs to their father's lineage or kin and not the mother's. This is why the children bear their father's name, inherits from their father side and have all the entitlements attached to their father's lineage. Residence is patrilocal. In patrilocal residency, the man with his immediate family members lives in his father's house. This system is found among the Yoruba and most Igbo people of Nigeria.

Matrilineal Descent System
This system is also known as "uxorial" descent system. This type of descent system is not common as the patrilineal descent system. The children are traced to their mother's lineage. The means of survival is carried out mostly by the women. This system is not the direct opposite of the patrilineal system in terms of authority. The authority is vested on the men but the economic means of survival is by the women. The maternal uncle( brother of the mother) holds a vital role in social responsibilities and inheritance. He is the social father and has a stronger relationship with his sister's children than the biological father of these children.

The children pay more respect to their social father(maternal uncle)  than to their biological father. The children born into such society inherits directly from their mother's side, which is mostly from their maternal uncle. Here, the king's biological son do not inherit the kinship from his father but instead, the king transfers his kingdom, title and status to his sister's son. Residence is matrilocal as the male child marries and lives into his mother's house or matrilineal descent. Some parts of the Eastern Igbo in Abia state practice matrilineal descent system.

Bilateral, Bilineal or Double Descent System 
This system is two-sided because an individual can be traced to, inherit from, and connected to both the father's and mother's side. There is a simultaneous affiliation to both sides. Usually, the landed and immovable properties such as the trees, forests, farm products are inherited through the male side while the movable properties and livestock are inherited matrilineally. This is common among the Yako people of Cross River State in Nigeria.

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Ambilineal Descent System 
This system is the combination of both the Patrilineal and Matrilineal descent systems. An individual can be traced to either of the two but he or she may select only one line to be traced to. The reason of choosing one side over the other has to do with the importance or benefits attached to each line. This system is flexible. A family  can be patrilineal for a period of time and matrilineal in the next generation. For instance, a man that marries a woman from a political or rich family can allow his children to be identified with their mother's family line.

Importance of Kinship system 
Descent or kinship system bind people together and defines social unity. Family members get support from the members of the people they are related with. The training of a child is done mostly by the people he or she is affiliated with. Kinship system regulates sexual relationship as it controls incest. Finally, the residence, membership and citizenship of am individual are defined by the kinship system. 

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