Your husband and your aunt are not related to each other.
You are an aunt/uncle-in-law! Congratulations!! You really are; because you're an aunt/uncle to your niece you are now an aunt/niece by marriage to her husband.
You are legally her aunt through marriage.
Your mother's aunt's husband's sister is your mother's aunts sister-in-law but is not related to you. Her son is not related to you either.
Your mother's sister's husband's sister is your aunt's sister-in-law, but is not related to you. Here's why: Your mother's sister is your aunt. The sister of a woman's husband would be her sister-in-law. In this case the woman is your aunt. So your mother's sister's husband's sister would be your aunt's sister-in-law.
No. Your Aunt's husband is related to her by her marriage, and therefore he is related to you and your mother by the marriage also. There is no blood relation. Blood relation means containing the same blood line.
Well, isn't that a happy little family tree question! Your aunt's husband's sister is your aunt by marriage. Just think of all the lovely family gatherings and painting sessions you can have together!
Your husband's niece is your niece, too. You and your husband are her aunt and uncle. Your brother is not related to a niece of yours who is the daughter of your husband's sibling.
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."
Your Aunt is your children's Great Aunt.
Aunt
Aunt in-law
Your aunt is your daughter's great aunt. Your daughter is your aunt's great niece.