Now the box may not have the remains of Jesus’ brother, but that aside, we do know that Jesus had brothers and sisters, of the biological kind ... :-) ...
See Post #14 and 21 ...
I never studied ancient Greek so I’ll take the word of an old archaeology professor that terms of relationship are not necessarily exactly translated.
Even if it were true that Jesus had brothers and sisters as we know that term, we do know he had many more disciples who called themselves his brother. The odds would be that the ossuary belonged to the latter group.
The Perpetual Virginity of Mary - Brothers and Sisters of Christ?
Virgin Birth—or Prophetic Slip?
The Perpetual Virginity of Blessed Mary
Aeiparthenos (An Anglo-Catholic Priest on Mary's Perpetual Virginity)
[Why I Am Catholic]: Because of the Protestant Reformers Beliefs On Mary
Catholic Biblical Apologetics: Mary: Virgin and Ever Virgin
Luther, Calvin, and Other Early Protestants on the Perpetual Virginity of Mary
Luther, Calvin, and Other Early Protestants on the Perpetual Virginity of Mary
The Protestant Reformers on the Virgin Mary
Zwingli’s’ Mariology: On Mary “Full of Grace”