When we accept Jesus Christ as Savior and Lord, we become members of the family of God. We are heirs of God and joint heirs with Jesus.
Child of God
For as many as are led by the Sprit of God, these are sons of God. For you did not
receive the spirit of bondage again to fear, but you received the spirit of adoption by
whom we cry out, “Abba, Father.” The Spirit Himself bears witness with our spirit that
we are children of God, and if children, then heirs- heirs of God and joint heirs
with Christ, if indeed we suffer with Him, that we may also be glorified together with
him. Rom 8:14-17
For you are all sons of God through faith in Christ Jesus. For as many of you as were baptized into Christ have put on Christ. There is neither slave nor free, there is neither male nor female; for your are all one in Christ Jesus. And if you are Christ’s, then you are Abraham’s seed, and heirs according to the promise. Gal 3:26-29
But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, to redeem those who were under the law, that we might receive the adoption as sons. And because you are sons, God has sent forth the Spirit of His Son into your hearts, crying our, “Abba, Father!” Therefore you are no longer a slave but a son, then as heir of God through Christ. Gal 4:4-7
Behold what manner of love the Father bestowed on us, that we should be called children of God! Therefore the world does not know Him. Beloved, now we are children of God; and it has not yet been revealed what we shall be, but we know that when He is revealed, we shall be like Him, for we shall see Him as He is. And everyone who has this hope in Him purifies himself, just as He is pure. I John 3:1-3