Your child would call your sister her aunt.
Your sister would call your child her niece or nephew depending on gender.
Your sister's children would call your child their cousin.
Niece if it's a female, and nephew if it's a male.
None of the Cimorelli sisters have a child.
Your sister's daughter is your niece. You are her aunt if you are female, or her uncle if you are male.
That would be your niece or nephew. Niece in Afrikaans is niggie, and nephew is neef
you call your parents sisters aunty
She has her sisters child, because she and Eminem adopted her (Alaina) ;-)
sisters in law
She is your niece.
She doesn't have sisters
Your grandmother's sisters are your Great Aunts.
If she is your sisters daughter then she is your neice :)
niece or nephew