"Romans 8:17
17And 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."
How do we qualify to share as "joint-heir-status", the adopted child will eventually become the physical child through Christ's leadership and guidance in the Christian's life.
Barne's Commentary "And if children - If adopted into his family.
Then heirs - That is, he will treat us as sons. An heir is one who succeeds to an estate. The meaning here is, that if we sustain the relation of sons to God, that we shall be treated as such, and admitted to share his favors. An adopted son comes in for a part of the inheritance, Numbers 27"... (How do we sustain a relationship with God, by following our lord and Master Jesus Christ.)
"Heirs of God - This expression means that we shall be partakers of that inheritance which God confers on his people. That inheritance is his favor here, and eternal life hereafter. This is an honor infinitely higher than to be heir to the most princely earthly inheritance; or than to be the adopted son of the most magnificent earthly monarch.
And joint heirs with Christ - Christ is by eminence the "Son of God." As such, he is heir to the full honors and glory of heaven. Christians are united to him; they are his friends; and they are thus represented as destined to partake with him of his glory. They are the sons of God in a different sense from what he is; he by his nature and high relation, they by adoption; but still the idea of sonship exists in both; and hence, both will partake in the glories of the eternal inheritance; compare Philippians 2:8-9; Hebrews 2:9-10. The connection between Christ and Christians is often referred to in the New Testament. The fact that they are united here is often alleged as a reason why they will be in glory, John 14:19, "Because I live, ye shall live also," 2 Timothy 2:11-12; "For if we be dead with him, we shall also live with him; if we suffer, we shall also reign with him, Revelation 3:21; "To him that overcometh will I grant to sit with me in my throne," etc., John 17:22-24."
http://barnes.biblecommenter.com/romans/8.htm
Tammy, did you catch in Romans how a Christian is able to acheive the status of "joint-heir", a position the adopted child typically did not share in ancient Jewish customs. Abraham's son to receive everything was Isaac. Those following our Master Jesus Christ, we will become something more elevated, receiving a greater share of Christ's riches as long as we demonstrate the "Spirit" is alive in our lives and if we do "suffer like Christ did", Christians have suffered many types of exquisite deaths in history for their obedience to Christ.
I don't know if "crofty" get the point that "Christians" after following lord Jesus Christ will eventually receive their inheritance of a "new body", Paul writes about. I am curious what his adoption remarks has to do with becoming a "true heir" "new body", "Sharing Christ's riches" by following, obeying and demonstrating Christ is our Master?