Being your sister's brother or sister you would be an uncle or an aunt to her daughter.
Your sisters daygter is your neice!
Your daughter and your sister's child are first cousins. Your daughter and your sister's grandchild are first cousins, once removed.
Your sister is great aunt to your daughter's child. The child is your sisters great nephew (if a boy) or great niece (if a girl).
The relation of the mother;s sister to daughter is niece-aunts.
Yes she has a daughter named Grace Penner!
Your sister's daughter is your niece, her granddaughter is your "great niece"... or you could just call her by name.
If she is your sisters daughter then she is your neice :)
If he is your brother in law then his sister is your sister in law. So your sister in law's daughter would be your niece.
That would be second cousin once removed. Your parent and your grandmother's sisters daughter were first cousins. You and the daughter's daughter are second cousins. There is a difference on one generation between the two of you.
rosemary.
If The Child Is A Girl = Neice If The Child Is A Boy = Nephew
Your first cousin's nephew's daughter is your first cousin twice removed.