An aunt is a person who is the sister, half- sister, step- sister, or sister -in- law of a parent, or the wife of one's uncle, but can also be an affectionate title for an older nurturing woman. Aunts are second -degree relatives and share 25% genetic overlap when they are the full sister of the parent. A half-aunt is a half- sister of one's parent and is a third-degree relative with 12.5% genetic overlap. If the aunt is a step- sister or sister -in- law, direct genetic overlap will typically be 0%, as this person entered the family through marriage and typically is not a blood relative.
A grand-aunt (sometimes written as grand aunt, grandaunt, or great-aunt) is the sister, half- or step- sister, or sister -in- law of a grandparent. The male equivalent of an aunt is an uncle, and the reciprocal relationship is that of a nephew or niece.
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