None.
Your daughter's husband is your son-in-law and his sister is your daughter's sister-in-law. But the English language does not consider you to be related to your daughter's husband's sister
Your sister and your husband's sister are not related.
Your husband's sister is your sister-in-law, but she is not related to your sister. Your husband is your sister'sbrother-in-law.
You and your husband are "aunt and uncle" to your sister's children. Your husband's sister is not related to your sister's children.
Your Sister-in-law
No. Your husband's sister-in-law is either your sister or the wife of one of his siblings. If she is the wife of one of his siblings, she is not related to you.
Your husband's cousin's sister is also your husband's cousin. You are not related to your husband's cousin.
Yes, I suppose that they would be sister-in-laws. Because your sister is your husband's sister-in-law, and the other sister is his sibling, then I suppose they would be sister-in-laws.
There is no common ancestor, so you aren't really related. Related by marriage is one way to describe the relationship.
sister in law
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.
you call her your daughter's husband's sister
Mom
Your husband's brother's wife is your husband's sister-in-law, but is not considered to be related to you. But I have the same thing, in my family, I consider my husbands, brothers girl friends as my sister, even though we are not really related but we both still say we are sisters!! so really you can pick if you want them to be your sister, but they will never actually be related to by name, or anything
brother in law
Sister-in-Law