A brother is a boy child, related to you by blood because your mother gave birth to both of you. He may be your older brother, or your younger brother. You may have more than 1 brother.
Note: A step-brother is not the same, genetically, as a full brother by blood relation.
Your brother is a male child of your mother and your father who is not you.
If your brother-in-law is the brother of your spouse, he is not related to your brother. If your brother-in-law is the husband of your sister, then he is also your brother's brother-in-law
brother
He is brother your brother in law.
The simple subject of the sentence in the question is brother.
No, your brother's brother-in-law is not related to you unless you and your brother both married children of the same parents and they had another brother. but the the brother-in-law relationship is not through your brother and his marriage, but because he is the brother of your spouse. Technically, the proper introduction would be, "This is my brother's brother-in-law" as there is no direct relationship between the two of you.
Your brother and you is correct.
Your husband's brother is your brother-in-law.
His sister.
Your wife's brother is your brother-in-law.
Your brother-in-law is either the husband of your sister or the brother of your husband. Your brother-in-law is not your husband's brother-in-law.
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.
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.