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In other words, half-brothers or half-sisters do not share their parents, sharing a family relationship, but not a biological relationship. A family in which one or both spouses have children from a previous marriage, is called the pivot family .
[citation needed] Interestingly, half-siblings can be related by as "three-quarters siblings" (related by 3/8) if their unshared parents have a consanguinity of 50%. This means the unshared parents are either siblings, making the half-siblings cousins, or parent and child, making them half- aunt-uncle and niece-nephew. [28]
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Sibling marriage is legally prohibited in most countries worldwide, [citation needed] with a partial exception being Sweden, where marriages between half-siblings are legally permitted. Innate sexual aversion between siblings forms due to close association in childhood, in what is known as the Westermarck effect .
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A half-niece or half-nephew is the child of one's half-sibling, related by 12.5%. [ 22 ] [ 23 ] In some cultures and family traditions, it is common to refer to cousins with one or more removals to a newer generation using some form of the word niece or nephew.