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  2. Consanguinity - Wikipedia

    en.wikipedia.org/wiki/Consanguinity

    The degree of kinship between two people may give rise to several legal issues. Some laws prohibit sexual relations between closely related people, referred to as incestuous. Laws may also bar marriage between closely related people, which are almost universally prohibited to the second degree of consanguinity.

  3. Cousin - Wikipedia

    en.wikipedia.org/wiki/Cousin

    A cousin is a relative that is the child of a parent's sibling; this is more specifically referred to as a first cousin.. More generally, in the kinship system used in the English-speaking world, a cousin is a type of relationship in which relatives are two or more generations away from their most recent common ancestor.

  4. Coefficient of relationship - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_relationship

    The kinship coefficient is a simple measure of relatedness, defined as the probability that a pair of randomly sampled homologous alleles are identical by descent. [11] More simply, it is the probability that an allele selected randomly from an individual, i, and an allele selected at the same autosomal locus from another individual, j, are ...

  5. Prohibited degree of kinship - Wikipedia

    en.wikipedia.org/wiki/Prohibited_degree_of_kinship

    In law, a prohibited degree of kinship refers to a degree of consanguinity (blood relatedness), or sometimes affinity (relation by marriage or sexual relationship) between persons that makes sex or marriage between them illegal. An incest taboo between parent and child or two full-blooded siblings is a cultural universal.

  6. Cousin marriage law in the United States - Wikipedia

    en.wikipedia.org/wiki/Cousin_marriage_law_in_the...

    Several states of the United States prohibit cousin marriage. [1] [2] As of February 2014, 24 U.S. states prohibit marriages between first cousins, 19 U.S. states allow marriages between first cousins, and seven U.S. states allow only some marriages between first cousins. [3]

  7. Cousin marriage - Wikipedia

    en.wikipedia.org/wiki/Cousin_marriage

    A cousin marriage is a marriage where the spouses are cousins (i.e. people with common grandparents or people who share other fairly recent ancestors). The practice was common in earlier times and continues to be common in some societies today, though in some jurisdictions such marriages are prohibited. [1]

  8. Kinship terminology - Wikipedia

    en.wikipedia.org/wiki/Kinship_terminology

    Kinship terminology is the system used in languages to refer to the persons to whom an individual is related through kinship.Different societies classify kinship relations differently and therefore use different systems of kinship terminology; for example, some languages distinguish between consanguine and affinal uncles (i.e. the brothers of one's parents and the husbands of the sisters of ...

  9. Systems of Consanguinity and Affinity of the Human Family

    en.wikipedia.org/wiki/Systems_of_Consanguinity...

    [2] [3] In the book Morgan argues that all human societies share a basic set of principles for social organization along kinship lines, based on the principles of consanguinity (kinship by blood) and affinity (kinship by marriage). At the same time, he presented a sophisticated schema of social evolution based upon the relationship terms, the ...