Your wife's niece is also your niece, and her daughter is your great niece.
It is to be hoped that you do not have a relationship WITH her, merely TO her.
Your niece is the daughter of your brother or sister. That relationship is not ended by divorce. If your brother married a woman who already had a daughter (from an earlier marriage), then she would be your "step-niece", and this relationship would, technically, be ended by a later divorce.
Grand niece.
Your niece's daughter is your great niece. You are her great aunt or great uncle, depending on your sex.
Great-niece.
Which One ? Hailie Jade Scott (Biological Daughter), Is 13. 25/12/95. Alaina Marie Scott, (His ex-Wifes, Twins Daughter. His Niece. But He Adopted Her) Is 16. 3/5/93 Whitney Laine Scott (His ex-Wifes Daughter From A Different Relationship Who He Cares For) Is 7 16/4/02 :]
your 2nd niece...!
Your daughter and your niece's child are 1st cousins once removed.
My niece's daughter is my great niece.
You are her grand uncle (or great aunt) and she is your grand niece.
Your granddaughters and son have the relationship of nieces and uncle. Your granddaughters being his nieces and your son being their uncle.
his ex wifes twins daughter
They are 2nd cousins.