Isaiah 9:6 shows that Jesus is a son of GOD. Jesus is not the only son of GOD. Job 1:6, Genesis 6:2, Job 38:7 among others, shows that GOD has many sons. In some bible translations, Sons of GOD are translated to Angels. Sons of GOD are the holy angels of GOD, they are GOD’s messengers. In Isaiah 9:6, Jesus is being called Mighty God, Everlasting Father, this prophesy from GOD through Isaiah that men would believe that Jesus is GOD in human form, hence men believe Jesus to be The Everlasting Father.
Isaiah 9:6 (author)
For to us a child is born, to us a son is given, and the government will be on his shoulders. And he will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace.
Job 1:6 (author)
Now there was a day when the sons of God came to present themselves before the LORD, and Satan also came among them.
Genesis 6:2 (author)
the sons of God saw that the daughters of man were attractive. And they took as their wives any they chose.
Job 38:7 (GOD)
when the morning stars sang together and all the sons of God shouted for joy
Elias, Malachi 4:5-6