uncle

Uncle (from Latin: avunculus the diminutive of avus "grandfather") is a male family relationship or kinship within an extended or immediate family. Uncles are second-degree relatives and share 25% genetic overlap when they are the full brother of one of the biological parents. An uncle is the brother of a parent. A half-uncle is the half-brother of one's parent. Uncle-in-law can refer to the husband of one's aunt or uncle of one's spouse. A biological uncle is a second degree male relative and shares 25% genetic overlap. The co-uncle-in-law is the husband of one's aunt of one's spouse. The co-uncle is the brother of one's spouse of one's sibling (uncle of one's niece or nephew who is not one's brother).
The female counterpart of an uncle is an aunt, and the reciprocal relationship is that of a nephew or niece.
A great-uncle/granduncle/grand-uncle is the brother of one's grandparent. Half-great-uncle/half-granduncle is the half-brother of one's grandparent. Great-uncle-in-law/granduncle-in-law is the husband of one's great-aunt/grandaunt. Great-uncle-in-law/granduncle-in-law and can also be great-uncle/granduncle of one's spouse. The co-great-uncle-in-law/co-granduncle-in-law is the husband of one's great-aunt/grandaunt of one's spouse.
A great-great-uncle/great-granduncle is the brother of one's great-grandparent. Half-great-great-uncle/half-great-granduncle is the half-brother of one's great-grandparent. Great-great-uncle-in-law/great-granduncle-in-law is the husband of one's great-great-aunt/great-grandaunt. Great-great-uncle-in-law/great-granduncle-in-law and can also be great-great-uncle/great-granduncle of one's spouse. The co-great-great-uncle-in-law/co-great-granduncle-in-law is the husband of one's great-great-aunt/great-grandaunt of one's spouse.

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