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Nephew and niece
A nephew is the son of someone's brother or sister. A niece is the daughter of the person's brother or sister. To the nephew or niece, the person is their uncle or aunt. The relationship of aunt/uncle to niece/nephew is an example of second-degree relatives, meaning that their coefficient of relationship is 25%. In some cultures and families, it is common to call the child of one's cousin a "niece" or "nephew". In old English, the son of one's sister was called a sister-son.
A sororal or fraternal relative is one who is related through there sister or brother. For example a sororal niece is the subject's sister's child. An in-law is a relationship that is not by blood, but instead by marriage. The in-law shares the in-law relationships of the spouses relatives. For niece or nephew in-law could be the child of a spouse.
Variation of terms
- Half-niece or half-nephew - The child of one's half sibling
- sororal niece or sororal nephew - sister's child.
- fraternal niece or fraternal nephew - brother's child.
- grandniece / great-niece: is a granddaughter of one's sibling