Humans in every culture structure a set of social relations that classify its members within the framework of a family. The notion of what constitutes a family can be fairly extensive in some groups, and more narrowly defined in other groups. For example, the concept of family is restricted to a smaller number of people in American culture than in Egyptian culture. When asked, students in the United States typically write down the names of 80 to 120 relatives when asked to name all the members of their family, while Egyptian students can usually write down over twice that number. Likewise, categories of classification-kinship terms, such as father or mother-can be extensive and incorporate a number of different social relationships, as for ...