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A second-degree relative (SDR) is someone who shares 25% of a person's genes. It includes uncles, aunts, nephews, nieces, grandparents, grandchildren, half-siblings and double-first cousins. [4] [5] [6] Third-degree relatives are a segment of the extended family and includes first cousins, great-grandparents and great-grandchildren. [7]
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.
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.
An uncle is usually defined as a male relative who is a sibling of a parent or married to a sibling of a parent, as well as the parent of the cousins. Uncles who are related by birth are second-degree relatives. The female counterpart of an uncle is an aunt, and the reciprocal relationship is that of a nephew or niece.
Grandparents are second-degree relatives to their grandchildren and share 25% genetic overlap. A step-grandparent can be the step-parent of the parent or the step-parent's parent or the step-parent's step-parent (though technically this might be called a step-step-grandparent).
A parent's first cousin may be called a second aunt. A great-aunt [ 2 ] [ 3 ] or grandaunt [ 4 ] (sometimes written grand-aunt [ 5 ] ) is the sister of one's grandparent. Genetics and consanguinity
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 ...
In a clinical sense, marriage between two family members who are second cousins or closer qualifies as consanguineous marriage. This is based on the gene copies their offspring may receive. [ 1 ] Though these unions are still prevalent in some communities, as seen across the Greater Middle East region, many other populations have seen a great ...