Who is the husband of the sister?
The main character of this article is her sister's husband. In a conversation, if you need to reflect this related relationship, you do not need to use two words, just one laconic title.
Who is the husband of the sister?
Remember it is extremely simple: the husband of the sister and for her brother, and for her sister - a brother-in-law or a son-in-law! Yes, yes, no tricky word! In the same way - your brother's husband will be called "your brother's husband" - your husband's husband will be called, and the sisters 'husbands for each other are sisters' husbands - one word can express two different family ties! But we will return to the husband of the sister. Probably, he also would like to know who his wife's sister is.
Who is the sister of the wife to her husband?
And again nothing new: sister-in-law! But what does the sister's husband have to his brother? Brother of his wife, he should already call his brother-in-law. Who is who we have to deal with. But how you will name your sister's husband - it's up to you! But remember: this is your let not blood, but "named" relative, and the way you call it speaks about your attitude towards it!