Your husband's niece is also your niece.
either your niece's husband, or your nephew, or your nephew in law, etc
that would be your niece or if you want to be fussy then your niece in law!
You aren't related. You do not share a common ancestor.
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.
No. Your wife's niece is also your niece, but the husband of the niece is not related to you or to your wife.
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.
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.
Your niece.Your brother's daughter would be your niece and you'd be her uncle or aunt. Your sister's daughter would also be your niece. If your sibling had a son, he would be your nephew.
You would call your sister's daughter your niece.
If your a boy they would call you great uncle, if your a girl they would call you a great aunt.
A niece. How could you not know that