Bible verse references:
[Joh 19:27] Then saith he to the disciple, Behold thy mother! And from that hour that disciple took her unto his own home.
[Joh 19:28] After this, Jesus knowing that all things were now accomplished, that the Scripture might be fulfilled, saith, I thirst.
[Joh 19:29] Now there was set a vessel full of vinegar: and they filled a sponge with vinegar, and put it upon hyssop, and put it to his mouth.
[Joh 19:30] When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.
I believed that Jesus made sure that Mary was cared for by John because of the verse19:28- “After this, Jesus knowing that all things were now accomplished”. Much like your “Last Will and Testament” of which you designate who will inherit your stuff after you die.
If Jesus is satisfied who will care for His mother, I don’t need to know where His brothers/sisters are.