A nephew is a son of a person 's sibling, and a niece is a daughter of a person 's sibling. Conversely, that person is the aunt or uncle of their niece or nephew. The gender - neutral term encompassing both nephews and nieces is nibling. The relationship of aunt / uncle to niece / nephew is an example of second - degree relatives, meaning that their coefficient of relationship is 25 %.
brother's daughter is called as in english
niece niece niece niece