Your brother's father-in-law is not related to you unless you and your brother married sisters from the same family. Then he would be your father-in-law, too.
He is brother your brother in law.
There is none, as there is no actual relationship.
If you have no siblings but your daughter has an uncle, he is the brother of your spouse, your brother-in-law.
Your brother-in-law is either the husband of your sister or the brother of your spouse.Where your brother-in-law is the husband of your sister, there is no relationship name in the English language to describe his brother's relationship to you. However, in that situation your brother-in-law's brother is your sister'sbrother-in-law.Where your brother-in-law is the brother of your spouse, his brother is also your brother-in-law.
Your wife's brother is your brother-in-law.
Unless your brother-in-law's brother is your husband, there is no direct relationship.
There is no word in the English language for a relationship between grandmothers of related grandchildren
Brother-in-law
Your brother's wife is your sister-in-law. The English language has no relationship term for the brother of your sister-in-law. He is not considered to be related toyou, although he is your brother's brother-in-law.
Your sister-in-law's husband is never your brother-in-law. He can be your brother, when your sister-in-law has that relationship to you because she is married to your brother. You could also have a sister-in-law who is the sister of your spouse. But then her husband is not related to you.
Your brother to her would be a brother-in-law.
Your son's wife is your daughter-in-law. Her brother is your son's brother-in-law, but the English language has no word for a relationship between you and him. You are not considered to be related to him.