The answers to these questions are quite simple...if you understand the dual nature of Christ.
Prior to his incarnation, Jesus was fully God.
During his incarnation, Jesus also became a man.
Why?
Because a man, Adam, had lost everything through his disobedience, and another man, Jesus, had to get it back by inheritance through his obedience.
During his incarnation, or when "the Word was made flesh and dwelt among us" (John 1:14), or in his humanity, Jesus was the Son of God (and he still is), and God was his Father (and he still is) for the reason which I just described.
While on earth, Jesus prayed:
Jhn 17:5
And now, O Father, glorify thou me with thine own self with the glory which I had with thee before the world was.
Jesus had glory with the Father before the world was because he was fully God himself.
Now, after his incarnation, death, burial, resurrection, ascension,
and glorification, he has been restored to that former glory, but now as one who is both God and man.
The man part is of utmost importance to us. In other words, we, as men or women, can only be made "joint-heirs with Christ" (Romans 8:17) because of what Jesus has inherited as a man.
Anyhow, this is the correct answer to your questions.