Christ brothers and sisters were his half brothers and sisters. Is that hard for you to understand. The trinity can be established in several ways but I like the scene of all three members of the Godhead being present at the Baptism of Jesus. As to Ecumenical councils, they are an invention of the Catholic church with no basis in scripture. Don't point me to the council at Jerusalem concerning circumcission. That was attended by apostles (Plural). Thought totally in error, the catholic church claims only one successor to the apostles, the Pope and he was not present at ano of the Councils decididing on the contents of the Bible. Incidently the seven extra books contained in the Catholic Bible were not there until placed there by the Catholic Church in 1521.
I note you use the term apocrypha which means noncanonical. It must be stressed that these books were not considered canonical by the Jews. The church inherited the canonical books from God's Old Covenant people, the Jews. (God also gave the church additional books, the New Testament, which completes the Holy Bible). Early church fathers like Origen, Cyril of Jerusalem, Athanasius, and the great Roman Catholic translator Jerome spoke out against the Apocrypha. Jerome stated the church reads them “for example and instruction of manners”, but does not “apply them to establish any doctrine”. More damning was his statement that “they exhibit no authority as Holy Scripture". Jerome himself separated the Apocrypha from the canonical books. The Catholic Church itself did not officially canonize the Apocrypha until the council of Trent in the 1500's. Luther did not remove these books - he merely returned them to the status that Jerome recognized. The RC Church has used them as an authority for bad doctrine - to establish doctrine that inspired doctrine would not give authority to.