Your sister's child is either your niece or nephew, depending on their gender.
Understanding the Relationship
According to the provided reference, the children of your sibling (brother or sister) are either your nieces or nephews:
- A nephew is the son of your brother or sister.
- A niece is the daughter of your brother or sister.
Conversely, you are their aunt or uncle.
Family Dynamics
The relationship between an aunt/uncle and a niece/nephew is classified as a second-degree relative relationship. This means that they share a coefficient of relationship of 25%. The reference notes that, if you are the aunt or uncle of the child, they are your niece or nephew.
Summary
| Your Relationship to Sister's Child | Child's Gender |
|---|---|
| Niece | Female |
| Nephew | Male |
Therefore, the exact answer depends on whether your sister's child is a boy or a girl.
