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  2. Coefficient of relationship - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_relationship

    A first-degree relative (FDR) is a person's parent (father or mother), sibling (brother or sister) or child (son or daughter). [1] It constitutes a category of family members that largely overlaps with the term nuclear family, but without spouses. [2] If the persons are related by blood, the first degree relatives share approximately 50% of ...

  3. Niece and nephew - Wikipedia

    en.wikipedia.org/wiki/Niece_and_nephew

    As aunt/uncle and niece/nephew are separated by one generation, they are an example of a second-degree relationship. Unless related by marriage, they are 25% or more related by blood if the aunt/uncle is a full sibling of one of the parents, or 12.5% if they are a half-sibling .

  4. Consanguinity - Wikipedia

    en.wikipedia.org/wiki/Consanguinity

    One legal definition of degrees of consanguinity. [1] The number next to each box in the table indicates the degree of relationship relative to the given person. Consanguinity (from Latin consanguinitas 'blood relationship') is the characteristic of having a kinship with a relative who is descended from a common ancestor.

  5. Bilateral descent - Wikipedia

    en.wikipedia.org/wiki/Bilateral_descent

    Bilateral descent is a system of family lineage in which the relatives on the mother's side and father's side are equally important for emotional ties or for transfer of property or wealth. It is a family arrangement where descent and inheritance are passed equally through both parents. [ 1 ]

  6. Family - Wikipedia

    en.wikipedia.org/wiki/Family

    When only the relative has the additional removal, the relative is the subjects siblings child, the terms Niece and Nephew are used for female and male relatives respectively. The spouse of a biological aunt or uncle is an aunt or uncle, and the nieces and nephews of a spouse are nieces and nephews.

  7. Sibling - Wikipedia

    en.wikipedia.org/wiki/Sibling

    Three-quarter siblings share one parent, while the unshared parents are first-degree relatives to each other, for example, if a man has children with two women who are sisters, or a woman has children with a man and his son. In the first case, the children are half-siblings as well as first cousins; in the second, the children are half-siblings ...

  8. Interpersonal relationship - Wikipedia

    en.wikipedia.org/wiki/Interpersonal_relationship

    In social psychology, an interpersonal relation (or interpersonal relationship) describes a social association, connection, or affiliation between two or more persons. It overlaps significantly with the concept of social relations , which are the fundamental unit of analysis within the social sciences .

  9. Lineal descendant - Wikipedia

    en.wikipedia.org/wiki/Lineal_descendant

    A lineal or direct descendant, in legal usage, is a blood relative in the direct line of descent – the children, grandchildren, great-grandchildren, etc. of a person.In a legal procedure sense, lineal descent refers to the acquisition of estate by inheritance by parent from grandparent and by child from parent, whereas collateral descent refers to the acquisition of estate or real property ...