cousins
Your brother's daughter is your niece. Her daughter is your great niece.
your brother's daughter is you niece
Your daughter is your uncle's grand niece.
Great-niece.
Your great great niece is the granddaughter of your niece or nephew. Your daughter and your niece or nephew are first cousins. Your daughter and your great great niece are first cousins, twice removed.
Your niece's son's daughter is your great grand niece. Your niece's son is your grand nephew or your great nephew, whichever term you prefer.
niece
Niece
your 2nd niece...!
Your aunt is your daughter's great aunt. Your daughter is your aunt's great niece.
you would be her aunt and she would be your niece
Your daughter and your niece are first cousins. Your daughter than your niece's son are first cousin's once removed. Your daughter's child and your niece's child are second cousins to each other.