but your brother is her husbande
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Grandfather. Or his name, the same as you would any other inlaws.
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.
sister in law
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.