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Family is established in extension of reproductive drives and natural forms of cooperation. Regardless of the types leading to what was called the family nucleus (husband and wife), families embody reciprocal obligations. The formalization of family life in marriage contracts was stimulated by writing.
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Although the processes leading to the formation of nations is relatively recent, nations were frequently characterized as an extended family, although the processes reflect structural characteristics of human practical experiences different from those at work in the constitution of the family.