(taken from www.qorbono.com weekly newsletter)
A. Actually, Jesus gave John to Mary, not Mary to John. These were his last words from the Cross and an integral part of his public ministry. In so doing, he wished for us all to understand the role that his mother is to play in our lives: through the suffering she endured on Golgotha, she gave birth to the body of Christ just as she gave birth to his head; a supernatural act of grace only possible through the sovereign suffering of Christ and under Him.
Therefore, her son wished for his mother to be the mother of all the believers and right when he was about to be born to eternal life, he told his mother what she had brought forth: a boy, her first son amongst the redeemed: St. John.