You call your brother's daughter your niece.
Your niece is a member of your extended family and shares a familial relationship with you. This relationship is a common term used within families to define how different members are related to one another. The inverse is also true; your brother's daughter will refer to you as her aunt or uncle.
Here's a breakdown of the key terms:
- Niece: The daughter of your brother or sister.
- Nephew: The son of your brother or sister.
- Aunt/Uncle: How you are referred to by your sibling's children.
Understanding these terms is important for navigating family relationships and clarifying connections within your family tree.