'Son' in the Bible

to reveal his Son in me so that I could preach him among the Gentiles, I did not go to ask advice from any human being,

I have been crucified with Christ, and it is no longer I who live, but Christ lives in me. So the life I now live in the body, I live because of the faithfulness of the Son of God, who loved me and gave himself for me.

But when the appropriate time had come, God sent out his Son, born of a woman, born under the law,

And because you are sons, God sent the Spirit of his Son into our hearts, who calls "Abba! Father!"

So you are no longer a slave but a son, and if you are a son, then you are also an heir through God.

But one, the son by the slave woman, was born by natural descent, while the other, the son by the free woman, was born through the promise.

But what does the scripture say? "Throw out the slave woman and her son, for the son of the slave woman will not share the inheritance with the son" of the free woman.