In tribal societies trust is placed with family members as opposed to those outside the family.This extends to marriage,where the most desirable marriages are with relatives.In one society on the northwest coast of British Columbia the most desirable marriage is between a boy and his mother's brother's daughter,which makes his mother's brother (maternal uncle)his father-in-law.This type of mating is called:

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The type of mating described in the scenario is consanguineous mating, which involves marriage or sexual relations between individuals who are closely related by blood. In this case, the most desirable marriage is between a boy and his mother's brother's daughter, which means they share a common maternal ancestor (the boy's mother and her brother). This type of mating is common in some tribal societies, where trust and social bonds are often stronger within families than between unrelated individuals. Assortative mating refers to the tendency of individuals to mate with others who are similar to them in certain characteristics, such as education or socioeconomic status. Incest refers to sexual activity between close relatives, such as siblings or parent-child relationships. Random mating occurs when individuals mate without regard for their genetic relatedness.

In Tribal Societies Trust Is Placed with Family Members as Opposed