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A half-aunt is a half-sister of a parent. A maternal aunt is the sister of one's mother. A paternal aunt is the sister of one's father. An aunt-in-law is the aunt of one's spouse. 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.
A maternal uncle is the brother of one's mother. A paternal uncle is the brother of one's father. Uncle-in-law is the uncle of one's spouse or the husband of an individual's aunt or uncle. A parent's first cousin may be called a second uncle. A great-uncle [4] [5] /granduncle [6] /grand-uncle [7] is the brother of one's grandparent.
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.
The immediate family is a defined group of relations, used in rules or laws to determine which members of a person's family are affected by those rules. It normally includes a person's parents, siblings, spouse, and children. [1]
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 ().
The spouse of a biological aunt or uncle is an aunt or uncle, and the nieces and nephews of a spouse are nieces and nephews. With further removal by the subject for aunts and uncles and by the relative for nieces and nephews the prefix "grand-" modifies these terms.
"Avunculate. The special relationship existing in some societies between a maternal uncle and his sister's son; maternal uncles regarded as a collective body. 1920 R. H. LOWIE Prim. Soc. v. 81 Ethnologists describe under the heading of avunculate the customs regulating in an altogether special way the relations of a nephew to his maternal uncle ...
The coefficient of relationship is a measure of the degree of consanguinity (or biological relationship) between two individuals. The term coefficient of relationship was defined by Sewall Wright in 1922, and was derived from his definition of the coefficient of inbreeding of 1921.