The Trinity is the Father, Son, and Holy Spirit that has been for all eternity.
They are often referred to as the 1st Person, 2nd Person, 3rd Person
Tho 3 divine Persons, they are one God.
The Father is called God, the Son is called God, the Holy Spirit is called God, yet there is
but one God.
The Son is referred to as the Son of the Father from all eternity.
The 2nd Person, the Son, became man, the baby of Mary, the son of Mary.
The 2nd Person is not only the Son of the Father in eternity, but also the son of Mary in time in this world.
The Son, the 2nd Person, is therefore both God, and man.
He is truely God, and truely man and has both divine and human natures.