The term Son is a heavenly title.
When Jesus Christ turned 30 years old he went to John to be baptized. Until that moment He did not have the title of Son, although He was one by inheritance.
Isaiah 9 “A child is born to us, a son is given to us”
Being a Son has to do with a heavenly position, given to be on earth. When Jesus Christ is baptized, the voice from heaven says “This is my beloved Son”, it is at that moment that Jesus positions himself as Son to fulfill His destiny.
He became the Son of Man, the Firstborn of the brothers.
Being a Son is a heavenly position, and the earth is groaning to see THE MANIFESTATION OF THE SONS OF GOD.
Ana Méndez Ferrell