Jesus called God His Father and His God!! The Father called Christ His Son but never called Him His God! We will see why as we go on.
Jesus declares Himself to be the Son of God.
John 10:36 "Say ye of him, whom the Father hath sanctified, and sent into the world, Thou blasphemest; because I said, I am the Son of God?"
Jesus was declaring Himself to be the Son of God and the Jews considered that blasphemy! You see, Jesus could never deny who He really was. It would be just like you or me declaring who we are. He did not say that He was one of the three members of a Trinity who took on the role of the Son of God. He said He was the Son of God!
Matthew 3:17 "And lo a voice from heaven, saying, This is my beloved Son, in whom I am well pleased."
As Jesus was baptized God spoke words of affirmation declaring that this was indeed the Son that He had sent into the world to be our Saviour. Again, at the transfiguration, God spoke these words:
Matthew 17:5 "While he yet spake, behold, a bright cloud overshadowed them: and behold a voice out of the cloud, which said, This is my beloved Son, in whom I am well pleased; hear ye him."
So, the Father tells us who this man was; it was His Son! Even the demons knew who Jesus was.
Matthew 8:29 "And, behold, they cried out, saying, What have we to do with thee, Jesus, thou Son of God? "
How is it that the demons called Jesus the Son of God? They had met Him before hadn't they? These very demons had lived in Heaven at one time, remember? When Satan (Lucifer) was cast out of Heaven he took a third of the angels with him. (Revelation 12:9) They knew who Jesus was; He was the only Son of God!! Remember that the controversy was initially over Satan's resentment of this Son who was exalted by the Father while he was not. It was this seed of discontent that turned into a full-scale war, attacking the character of God as seen in His law.