Your wife's brother-in-law is either your brother or the husband of her sister.
In the first case, her brother-in-law's brother is you or one of your other brothers.
In the second case, her brother-in-law's brother is not related to you.
Your wife's sister's husband is your wife's brother-in-law, but is not related to you.
You wife's uncle or "uncle by marriage".
in-laws. My wife's mother is my mother in law. My wife's brother is my brother in law. (and so on)
I dont see why not! GO FOR IT!
There are no laws about immoral activities such as infidelity.
Your sister in law is your husband's sister or your brother's wife.
You are your brother's wife's brother-in-law, if you are male. But your brother's wife can also have brothers-in-law who are not related to you or to your brother. They would be the husband's of the wife's sisters.
Your wife's brother is your brother-in-law.
Your wife's brother is your brother-in-law. Your brother-in-law's wife is not related to you, and the same applies to her sister.
The husband's brother is a brother-in-law to the wife. The wife's brother is a brother-in-law to the husband. However, the husband's brother is not related to the wife's brother.
Your wife's brother is your brother-in-law.
Your mother's brother is your uncle. Your father is his brother-in-law but he could also have other brothers-in-law. These would be men married to his other sisters, or the brothers of his wife. If they are men who married his other sisters, they are your uncles. If they are brothers of his wife, they are not related to you.