I will not argue with you. I happen to believe that the ‘brothers and sisters’ mentioned in scripture were Joseph’s children by a previous marriage, not children younger than Jesus born to Mary. These siblings of Jesus very possibly did not accept Mary for whatever reasons. We are told that James was the brother of Jesus, and that this same James did not accept his brother being the Messiah until after Jesus rose from the dead and present himself to the disciples. Jesus leaves James to be the head of the Church in Jerusalem, so Jesus and the other disciples thought highly of James by that reckoning.
V. Jesus’ “Brothers” (adelphoi)) = Cousins or Kinsmen
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.”
Tobit 5:11 - Tobit asks Azarias to identify himself and his people, but still calls him “brother.”
Amos 1: 9 - brotherhood can also mean an ally (where there is no bloodline).