either your niece's husband, or your nephew, or your nephew in law, etc
No. Your wife's niece is also your niece, but the husband of the niece is not related to you or to your wife.
that would be your niece or if you want to be fussy then your niece in law!
Technnically, she is not related as you do not share a common ancestor. She would refer to you as Aunt and she is your niece. Whether he is your first, second or fifth husband, his niece is your niece while you are married to him.
You aren't related. You do not share a common ancestor.
You can call them their real name...or...niece
Your husband's niece is also your niece.
niece.
Your niece will call you her aunt or uncle.
Your niece's daughter is your grand niece, or, as some would say, your great niece.
Your niece's daughter is your grand niece, or, as some would say, your great niece.
I will call her niece.
Your sister's daughter is your niece, her granddaughter is your "great niece"... or you could just call her by name.