'Sons' in the Bible

Notice therefore that those who possess faith are true sons of Abraham.

You are all sons of God through faith in Christ Jesus;

in order to purchase the freedom of all who were subject to Law, so that we might receive recognition as sons.

And because you are sons, God has sent out the Spirit of His Son to enter your hearts and cry "Abba! our Father!"

For it is written that Abraham had two sons, one by the slave-girl and one by the free woman.