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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]
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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.
If two half-siblings procreate, their children have three grandparents instead of four (25%). If a child and parent were to procreate, their offspring would have four grandparents; so, procreation between parents and children would result in less pedigree collapse than procreation between full siblings – although one of the grandparents would ...
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 .
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 .
This list of sibling pairs includes certain twins, provided they have at least one additional older or younger sibling, with also mentioned their reason of fame. Siblings are arranged alphabetically by last name; listed from oldest to youngest .