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Your sister-in-law's niece is not related to you because you have no ancestors in common.
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The above answer is true, but by marriage, that niece would also be your niece or your own daughter. This is because your spouse is blood/sibling related to his/her sister (your sister-in-law).
What else can I help you with?
Are you related to your niece's husband's sister?
Your sister's husband is your brother-in-law. His niece is a child of one of his siblings, and is also a niece of your sister by marriage. There is no relation to you.
What relation is your aunt's niece?
Your Aunt's niece is you (if you are female), your sister, or your First Cousin.
What relation would it be to me if it was my brother-in-law's niece?
Nothing. Your niece in law. Your brother in laws niece.
What relation is my sister's granddaughter to my brother?
Great niece
What is relation to you your wifes sister?
Probably your niece-in-law.
What is the relation between you and your Mather's sister?
You are her niece or nephew (niece if female, nephew if male) and she is your aunt.
What will my relation be with my sister's daughter?
you would be her aunt and she would be your niece
What relation to me is the child of my sister's child?
He or she is your great-niece/nephew
What relation is your sister's son's wife to you?
Probably your niece-in-law.
What relation are my sister's children to me?
You are their aunt or uncle and they are your niece or nephew.
What relation are you to your husband's sister?
Your sister's daughter is your niece and you are either her aunt or her uncle. The English language has no term for your niece's husband, other than calling him "niece's husband."
What relation is your sister's granddaughter's daughter to you?
Your sister's daughter is your niece. Your sister's granddaughter is your great niece Your sister's granddaughter's daughter (your sister's great granddaughter) is your great great niece. You are her great great aunt, if you are a woman, or her great great uncle, if you are a man.
