A person's grandchild and grand niece are 2nd cousins to each other.
No. A great grand child is the child of your grandchild. The child of your grand niece is your grand niece or grand nephew, depending on the child's sex.
Your niece's child is your great niece if she is a girl, or your great nephew if he is a boy.
Great grand niece
The child of your niece is your great nephew (if the child is a boy) or your great niece( if the child is a girl). You are the child's great aunt, because you are a woman. A man would be the child's great uncle.
you would be the child's great aunty or uncle Therefore, they would be your great niece or nephew.
Your daughter and your niece are first cousins Your daughter and your great grand niece are first cousins, twice removed.
Your niece's son is your grand-nephew. You are the child's grand aunt, or grand uncle (whichever applies).
Great niece's baby is your great-great niece or great-great nephew.The system works like this:Your niece's child is your great niece/nephewYour great niece's child is your great great niece/nephewYour great great niece's child is your great great great niece/nephewYour great great great niece's child is your great great great great niece/nephew...
Your niece's son is your grand-nephew. You are the child's grand aunt, or grand uncle (whichever applies).
You are her grand uncle (or great aunt) and she is your grand niece.
Yes, your niece's daughter is your grand niece. You are her great aunt or great uncle.
Your niece's child and your grandson's child (your great grandchild) are second cousins, once removed, to each other.