Does Galatians 4:7 agree with Romans 8 about being a son and an heir?
Yes. Galatians 4:7 stands in complete agreement with Romans 8, where believers are called children, true sons, and heirs. It says the believer is no longer a slave but a son, one in full heirship, an heir of God through Christ, matching Romans 8's declaration of joint heirship with Christ.
Les teaches that Romans 8 first establishes that believers are children of God; if they are true sons by saving faith, then they are heirs—heirs of God, not merely of a rich human relative or corporation. He then tightens it further: they are joint heirs with Jesus Christ. He illustrates joint heirship through shared property ownership: both owners have rights to the property, and if one passes away, it belongs to the survivor. This joint heirship is part of the Christian experience, and it may include suffering with Christ and experiencing glorification with Him. Returning to Galatians, Les points out that verse 7 is in complete agreement with Romans 8: “Wherefore thou art no more a slave, but a son, a one in full heirship, an heir of God through Christ.”
Wherefore thou art no more a servant, but a son; and if a son, then an heir of God through Christ.
And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together.