I'm assuming you mean Fidel Castro from Cuba. Here are all his siblings: Raúl Castro, Juanita Castro, Ramón Castro Ruz, Pedro Emilio Castro Argota, Emma Castro, Agustina Castro, Ángela María Castro Ruz, Lidia Castro Argota, Antonia Maria Castro Argota, Manuel Castro Argota, Georgina Castro Argota
Fidel Castro. its also called Fidels' missile crisis. Fidel Castro
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.