It would be contrary to Jewish custom for Jesus to hand over His mother to anyone other than an immediate family member. A scandal. You pointed that out in #593 but it fell on deaf ears. At this time, Jewish customs were rigidly adhered to, including the vows women could make as described in Numbers 30.
Once upon a time, almost no Christians denied that Mary the mother of Jesus was perpetually a virgin: including Protestants. Of the early leaders of that movement, virtually all fully accepted this doctrine: including Luther, Calvin, Zwingli, Bullinger, Turretin, and Cranmer. Moreover, most Protestant exegetes
continued to believe it for at least another 350 years or so.
But today, for various reasons, things are very different, so it's helpful to revisit the biblical arguments, since the Bible is the authority all Christians revere in common. A surprising number can be found.
1) Luke 2:41-51 describes Mary and Joseph taking Jesus to the temple at the age of twelve, for the required observance of Passover. Everyone agrees that He was the first child of Mary, so if there were up to five or more siblings, as some maintain (or even one), why is there no hint of them at all in this account?
Did Mary and Joseph hire babysitters for the trip to Jerusalem?
Biblical Evidence for the Perpetual Virginity of Mary