I think this is going OT, but I disagree with you here. It doesn’t have to mean blood brothers and sisters at all. There are
many examples of the word “brother” not meaning “children of the same parents” in Scripture.
Luke 1:36 - Elizabeth is Mary’s kinswoman. Some Bibles translate kinswoman as “cousin,” but this is an improper translation because in Hebrew and Aramaic, there is no word for “cousin.”
Luke 22:32 - Jesus tells Peter to strengthen his “brethren.” In this case, we clearly see Jesus using “brethren” to refer to the other apostles, not his biological brothers.
Acts 1:12-15 - the gathering of Jesus’ “brothers” amounts to about 120. That is a lot of “brothers.” Brother means kinsmen in Hebrew.
Acts 7:26; 11:1; 13:15,38; 15:3,23,32; 28:17,21 - these are some of many other examples where “brethren” does not mean blood relations.
Rom. 9:3 - Paul uses “brethren” and “kinsmen” interchangeably. “Brothers” of Jesus does not prove Mary had other children.
Gen. 11:26-28 - Lot is Abraham’s nephew (“anepsios”) / Gen. 13:8; 14:14,16 - Lot is still called Abraham’s brother (adelphos") . This proves that, although a Greek word for cousin is “anepsios,” Scripture also uses “adelphos” to describe a cousin.
Gen. 29:15 - Laban calls Jacob is “brother” even though Jacob is his nephew. Again, this proves that brother means kinsmen or cousin.
Deut. 23:7; 1 Chron. 15:5-18; Jer. 34:9; Neh. 5:7 -“brethren” means kinsmen. Hebrew and Aramaic have no word for “cousin.”
2 Sam. 1:26; 1 Kings 9:13, 20:32 - here we see that “brethren” can even be one who is unrelated (no bloodline), such as a friend.
2 Kings 10:13-14 - King Ahaziah’s 42 “brethren” were really his kinsmen.
1 Chron. 23:21-22 - Eleazar’s daughters married their “brethren” who were really their cousins.
Neh. 4:14; 5:1,5,8,10,14 - these are more examples of “brothers” meaning “cousins” or “kinsmen.”
The Scriptures also
never refer to God the Father, Jesus the Son, and the Holy spirit as the Holy Trinity, but I’m sure you believe in the Trinity, don’t you?
It’s simple logic, especially if you look at Rev 12:17 in light of John 19:26:
John 19:26 - Jesus makes Mary the Mother of us all as He dies on the Cross by saying “behold your mother.” Jesus did not say “John, behold your mother” because he gave Mary to all of us, his beloved disciples. All the words that Jesus spoke on Cross had a divine purpose. Jesus was not just telling John to take care of his mother.
Rev. 12:17 - The “woman’s” (Mary’s) offspring are those who follow Jesus. She is our Mother and we are her offspring in Jesus Christ. The master plan of God’s covenant love for us is family. But we cannot be a complete family with the Fatherhood of God and the Brotherhood of Christ without the Motherhood of Mary.