Jesus himself said that He was the Son of God: “Then they all said, ‘Are You then the Son of God?’ So He said to them, ‘You rightly say that I am.” (Luke 22:70). Jesus also often refers to God as His Father.
Also God is calling Jesus His Son “And a voice from heaven said, “This is my Son, whom I love; with him I am well pleased.” (Mathew 3:17). It refers to the close connection that exists between God the Father and Jesus the Son (Luke 1:32)
The word “Son” in Bible history is also an indication for a relationship. In other parts of the Bible, Jesus is also called The Word of God. The Hebrew word “son” also can mean decendant or follower.
When you become a follower of Christ, you will recieve the Holy Spirit and become a child of God as is written in Romans 8:14; For those who are led by the Spirit of God are the children of God.