it depends if u treat her good then its good if u treat her bad your going to get a attitude back.
There would be no relationship as you do not share a common ancestor. If your brother-in-law is married to your sister, then her daughter is your niece, her husband would be referred to as your niece's husband.
Your sister's daughter is your niece. Your niece's husband is not related to you.
She has no relationship with you. You do not share a common ancestor. You technically are not even related to your niece's husband.
they would be cousins.
The husband of your niece is your niece's husband. The English language and the major English-speaking cultures of the world do not have a relationship term for that person and do not consider you to be related to him.
To your sister's daughter you are an aunt (or uncle) and she is your niece. To your niece's daughter ( your sister's granddaughter) you are a great-aunt (or great-uncle) and she is your grand-niece.
Your great grandson and your husband's great niece are second cousins, once removed.
Your wife's brother's daughter is her niece and your wife is her niece's aunt. Although you have no genetic relationship to your wife's niece, by convention your wife's niece is considered to be your niece and you are her uncle.
I think that's it: "great-niece's husband." Or if you'd prefer a shorter phrase, there's always "acquaintance."
Your husband's brother's wife's niece may be the daughter of one of your husband's brother's siblings. That could make the niece your daughter, or your niece through your husband and another of his siblings. On the other hand, the niece in question could be the daughter of the brother's wife's sibling. In that case she is not related to you at all.
The granddaughter is the niece's first cousin once removed.
If you are a female you could be talking about yourself. You could also refer to a sister this way. This could also refer to a cousin of yours, since your aunt's husband may have nieces through more than one sibling (either his siblings or your aunt's siblings). It is not clear whether you are related to your aunt or to your uncle by blood, but it is very probably one of them and not both.If your aunt is the sister of one of your parents, then her husband (your uncle) may have nieces who are not related to you at all. These would be the daughters of his siblings.