So who was the mother of the Son of God?
Somebody, other than Mary?
Yes.
"And as he was yet speaking, behold a bright cloud overshadowed them. And lo, a voice out of the cloud, saying: This is my beloved Son, in whom I am well pleased: hear ye him."Matthew 17:5
We're waiting to hear your explanation as to how this verse has anything to do with Mary.
Somebody, other than Mary?
I'm still waiting for you answer.
Mary is the mother of Jesus “The Son of Man”. She didn’t give birth to God. To give birth is to begin a new life. God existed from forever. Jesus gets His identity as The Son of God from His Father, who is God. Jesus is, was and always will be life itself.