Great Grand daughter.
You call your daughter's baby, your grand-duaghter.
Your grand daughter's husband is your grandson-in-law.
Your niece's daughter is your grand niece, or, as some would say, your great niece.
Granddaughter
Your grandson.
Your grand daughter.
You would call your sister's daughter your niece.
They'd be your cousin.
Your daughter's daughter is your grand daughter. Your nephew's daughter is the granddaughter of your sibling (your brother or sister) The grandchildren of siblings are second cousins.
Your grandson.
To your sister's daughter you are an aunt (or uncle) and she is your niece. To your niece's daughter ( your sister's granddaughter) you are a great-aunt (or great-uncle) and she is your grand-niece.
when was lil Wayne daughter born and how old she is