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[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]
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.
Person known to be biologically related as parent, child, grandparent of any degree, grandchild of any degree, brother, sister, half-brother, half-sister, uncle, aunt, nephew, niece. Marriage, sexual intercourse, sodomy: 5m-13m (simple), 31m-136m and/or up to $100,000 fine for either simple or aggravated. [38] Kentucky
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.
An avunculate marriage is a marriage with a parent's sibling or with one's sibling's child—i.e., between an uncle or aunt and their niece or nephew. Such a marriage may occur between biological (consanguine) relatives or between persons related by marriage ( affinity ).
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 .
In Australia, federal marriage law prohibits marriage between an ancestor and descendant or siblings (including a sibling of half-blood), including those traced through adoption. [140] However, under federal law, sexual conduct between consenting adults (18 years of age or older) is legal, [ 141 ] [ 142 ] which also applies to close family members.
The Australian Fair Work Act 2009, Section 12, defines immediate family as "a spouse, de facto partner, child, parent, grandparent, grandchild or sibling of the employee; or a child, parent, grandparent or sibling of a spouse or de facto partner of the employee.", and "the definition of the term ‘de facto partner’ includes a former de facto ...