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The degree of relative consanguinity can be illustrated with a consanguinity table in which each level of lineal consanguinity (generation or meiosis) appears as a row, and individuals with a collaterally consanguineous relationship share the same row. [5]
Third-degree relatives are a segment of the extended family and includes first cousins, great-grandparents and great-grandchildren. [7] Third-degree relatives are generally defined by the expected amount of genetic overlap that exists between two people, with the third-degree relatives of an individual sharing approximately 12.5% of their genes ...
The first prohibited degree of consanguinity was a parent-child relationship while a second degree would be a sibling relationship. A third degree would be an uncle/aunt with a niece/nephew while fourth degree was between first cousins. [4]
Consanguine marriage is marriage between individuals who are closely related. Though it may involve incest, it implies more than the sexual nature of incest.In a clinical sense, marriage between two family members who have coefficient of relationship r = 3.125% (i.e. second cousin, first cousin twice removed, half-first cousin once removed, great-great-great-grandmother / great-great-great ...
Canon 109 of the Code of Canon Law of the Catholic Church provides that affinity is an impediment to the marriage of a couple, and is a relationship which "arises from a valid marriage, even if not consummated, and exists between a man and the blood relatives of the woman and between the woman and the blood relatives of the man."
second-degree: 25% (2×2 −3) third-degree half-aunt / half-uncle / half-niece / half-nephew: third-degree: 12.5% (2 −3) third-degree first-cousin: third-degree: 12.5% (2×2 −4) fourth-degree half-first-cousin: fourth-degree: 6.25% (2 −4) fourth-degree great-grandmother / great-grandfather / great-granddaughter / great-grandson: third ...
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 ...
In biology, "kinship" typically refers to the degree of genetic relatedness or the coefficient of relationship between individual members of a species (e.g. as in kin selection theory). It may also be used in this specific sense when applied to human relationships, in which case its meaning is closer to consanguinity or genealogy .