A more thorough explanation:

Definition: A half niece is the daughter of one's half brother or half sister.

For example, if John has a half sister named Sarah, and Sarah has a daughter named Emily, then Emily is John's half niece.

This term is different from the term "niece," which refers to the daughter of a person's brother or sister. However, in some cases, the term "niece" may be used to include the daughter of a person's brother-in-law or sister-in-law. Additionally, some wills may use the term "niece" to include a grandniece.

Understanding the difference between a niece and a half niece can be important in family relationships and legal matters, such as inheritance and custody.