It would be perfectly fine to give your niece a summer dress as a present, many companies that sell them can be found via the internet and there is a wide variety.
Since it's her husband's niece the niece is just your sister's niece through marriage and not your niece.
Your sister's daughter is your niece. If you are a woman, you are your niece's aunt; if you are a man, you are your niece's uncle. Your sister's son is your nephew.
Your mother's niece is your first cousin. Your first cousin's daughter is your first cousin, once removed.
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 child is your great niece if she is a girl, or your great nephew if he is a boy.
Your niece's daughter is your grand niece, or, as some would say, your great niece.
Your husband's niece is also your niece.
My bother/ sisters child. or my friends niece. it was her niece. I you don't have a niece just never say the words I have a niece.
Yes, your niece's daughter is your grand niece. You are her great aunt or great uncle.
Your husband's great niece is also your great-niece in law, so your great niece would be great niece in law to your husband.
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.