If one is begotten, then one cannot be adopted by those same parents. The idea of being begotten means that you are the biological progeny of your parents. In other words, the woman whom you call “mother” is the same woman who gave birth to you. But, in the case of adoption, the woman whom you call “mother” is not the same woman who gave birth to you. (Let’s recall that the New Testament was written in the 1st century A.D. There were no such things as in-vitro fertilization or surrogate motherhood.) Likewise, if you are adopted, your father is not the same man who begat you. With that being said, how can we reconcile the fact that Christians are said to be both begotten/born again and adopted?

Begotten
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* John 1:12-13 cp. 1 Pet. 1:3

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> 12 But to those who received him, he gave them power to become the sons of God, even to those who believe that believe in his name, 13 who were begotten, neither of blood, nor of the will of the flesh, nor of the will of man, but of God.
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> ΙΒʹ ὅσοι δὲ ἔλαβον αὐτόν ἔδωκεν αὐτοῖς ἐξουσίαν τέκνα θεοῦ γενέσθαι τοῖς πιστεύουσιν εἰς τὸ ὄνομα αὐτοῦ ΙΓʹ οἳ οὐκ ἐξ αἱμάτων οὐδὲ ἐκ θελήματος σαρκὸς οὐδὲ ἐκ θελήματος ἀνδρὸς ἀλλ᾽ ἐκ θεοῦ ἐγεννήθησαν TR, 1550
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Adopted
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* Gal. 4:5 cp. Rom. 8:15; Eph. 1:5

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> 5 in order to redeem those who were under the Law, so that we may receive the adoption of sons.
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> Εʹ ἵνα τοὺς ὑπὸ νόμον ἐξαγοράσῃ ἵνα τὴν υἱοθεσίαν ἀπολάβωμεν TR, 1550
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Michael Peppard wrote,

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> In the move from proclamation to narration, however, each early Christian theologian had to make a decision about how to portray the metaphor of divine sonship. Is it begotten or adopted? By the fourth century, the answer would become mostly clear: the divine sonship of Jesus Christ was by begetting and that of everyone else was by adoption. But in the first two centuries, and especially in areas more influenced by Roman culture, a high view of adopted sons was well established.
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References
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Peppard, Michael. “Adopted and Begotten Sons of God: Paul and John on Divine Sonship.” *Catholic Bible Quarterly*, vol. 73, no. 1, 2011, pp. 92–110.