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No, they do not have any right of the sort. The niece's parents may allow them to visit, but there is no legal obligation to do so at all.
Some children are slow at picking up speech. Talking to her a lot and reading to her will help. If she seems to be a normal child otherwise, don't worry about it.
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.