Your husband's sister is your sister-in-law.
sister in law
Your sister's husband is your brother-in-law.
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.
Your Sister-in-law
you call her your daughter's husband's sister
Mom
There is no common ancestor, so you aren't really related. Related by marriage is one way to describe the relationship.
brother 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.
Sister-in-Law
jacquline
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.