Sorry, I don't see where it says the Blessed Virgin Mary is the mother of anyone but Jesus.<quoted text>
Read for yourself;
Matthew 12:46 While Jesus was still talking to the crowd, his mother and brothers stood outside, wanting to speak to him.
Matthew 13:55 "Isn't this the carpenter's son? Isn't his mother's name Mary, and aren't his brothers James, Joseph, Simon and Judas?
Matthew 13:56 Aren't all his sisters with us? Where then did this man get all these things?"
Thank you for searching for it though.