Your mother's only sister would be would be your aunt. Your aunt's husband would be your uncle. Your uncle's sister in law would be your aunt's sister who is your mom. You were introduced to your mom.
The English language has no term for a relationship between you and your husband's sister's husband. Most people would not consider her to be related to you. You could call her your sister-in-law's husband.
Your husband's sister is your sister-in-law. Her husband is your husband's brother-in-law. But your sister-in-law's husband is not related to you.
Your husband's sister is your sister-in-law. Her husband is your husband's brother-in-law. But your sister-in-law's husband is not related to you.
You would call your sister's husband your brother-in-law.
The sister of your husband is your sister-in-law.
The English language has not special term for the husband of your sister-in-law. You woudl call him your "sister-in-law's husband."
you call her your daughter's husband's sister
sister
The English language has no term for a relationship between you and your husband's sister's husband. Most people would not consider her to be related to you. You could call her your sister-in-law's husband.
No. You have no ancestor in common with his new daughter, so you are not related.
sister in law