If your sister-in-law is the sister of your spouse, her brother is the brother of your spouse and your brother-in-law. If you are a woman, and your sister-in-law is the sister of your husband, then her brother could also be your husband.
If your sister-in-law is the wife of your brother, then her brother is not related to you.
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If your uncle is the brother of one of your parents, his wife is your aunt but her mother is not related to you.
If your uncle married the sister of one of your parents, his wife's mother is your grandmother.
If your sister-in-law is the sister of your spouse, then her brother is your brother-in-law. If your sister-in-law is the wife of your brother, then her brother is not related to you.
If your brother in law's daughter is also your brother's daughter, then she would be considered your niece.
Your sister's husband is your brother-in-law. His borther is not related to you, but is your sister's brother-in-law.
Your brother-in-law's wife would be your sister (in law), which means that she would probably be related to you (unless either of you were adopted).