Sonship in Paul’s writings is the place Christians have in connection with God, into which Christ has brought them by redemption; that is, His own relative place with God according to His counsels. “Children” is that they are of the Father’s family. Both are found in Romans 8:14-16, and the force of both may there be seen. We cry Father, so are children, but by the Spirit we take up the place of grownup sons with Christ before God.