This notion treats each of the Divine Persons of the Trinity as *parts* of God. But the *Persons* of the Divine Trinity are not parts of God. Each of the three Persons is God, not a part of God. That is why the line in the Athanasian Creed reads, "So the Father is God, the Son is God, and the Holy Ghost is God. And yet they are not Three Gods, but One God."
No wonder you are having a hard time with "mother of God". First get your understanding of the Trinity straightened out, and "mother of God" will be no problem.
-A8
This is Mary the mother of The Father?
I've got my understanding of the Trinity "straigtened out". You seem to have a problem with it by saying Mary is mother of God but only applying that to the 2nd person of the trinity. It is you doing the division of God, not myself.