I have had discussions with my Catholic family where they say how Jesus did not have brothers because that would contradict the Catholic belief that Mary remained a life long virgin. Didn’t Jesus indeed have brothers?
Mark 6:1-3 mentions four brothers, James, Joseph, Jude, and Simon. (James and Jude are believed to be the writers of the epistles by those names.) Matt. 12:46 also speaks of the Lord’s brothers. Mark also mentioned some sisters whose names are not known to us. John 7:1-5 is a conversation between the Lord and His brothers. None of them were believers before the resurrection. For an Old Testament prophecy that he would have unbelieving brothers read Psalm 69:7-9.
By the way, the New Testament explains that all Church Age believers will one day become the Lord’s brothers and sisters. John 1:12-13 explains that believers receive the authority to become children of God. Romans 8:29 says God predestined us to be conformed to the likeness of His son that He might be the firstborn among brothers. Galatians 4: 4-7 says God has adopted us into His family and made us both His children and His heirs. Romans 8:17 agrees that we’re heirs of God and co-heirs with Christ.