There is no distinct Personalities of The Father and The Son. Nowhere in scriptures they became two distinct Persons.
The Personality of God is invested in the Firstborn over all creation.
The Father is in The Son and The Son is in the Father as Echad.
Heb 1:
1 God, having in the past spoken to the fathers through the prophets at many times and in various ways,
2 in these last days has spoken to us in a Son, whom he appointed heir of all things, through whom also he made the worlds.
Before Bethlehem there was no Son of God but only in prophetic scriptures. God manifest in flesh is The Son of God. He existed as God and was revealed to Israel as Yahuah, The Father in covenant relationship. Israel is God's firstborn, Heir to God's promises. That's why He manifested as The Son of God, representing Israel and Mediating for Israel.
Exod 4:
22 “And you shall say to Pharaoh, ‘Thus said יהוה, “
Yisra’ĕl is My son, My first-born,
Rom 8:
29 Because those whom He knew beforehand, He also ordained beforehand to be conformed to the likeness of
His Son, for Him to be the first-born among many brothers.
It's for Israel He came because Israel is the heir:
Gal 4:
1 But I say that
so long as the heir is a child, he is no different from a slave, though he is lord of all;
2 but is
under guardians and stewards until the day appointed by the father.
3 So we also, when we were children, were held in bondage under the elemental principles of the world.
4 But when the fullness of the time came, God sent out his Son, born to a woman, born under the law,
5 that he might redeem those who were under the law, that we might receive the adoption of children.
Christianity has diluted the truth by introducing Trinitarianism. It's far from truth.