Whether each of the Divine Persons could have assumed human nature?

❌ Objection 1 : It would seem that no other Divine Person could have assumed human nature except the Person of the Son. For by this assumption it has been brought about that God is the Son of Man. But it was not becoming that either the Father or the Holy Ghost should be said to be a Son; for this would tend to the confusion of the Divine Persons. Therefore the Father and Holy Ghost could not have assumed flesh.

❌ Objection 2 : Further, by the Divine Incarnation men have come into possession of the adoption of sons, according to Rm. 8:15: "For you have not received the spirit of bondage again in fear, but the spirit of adoption of sons." But sonship by adoption is a participated likeness of natural sonship which does not belong to the Father nor the Holy Ghost; hence it is said (Rm. 8:29): "For whom He foreknew He also predestinated to be made conformable to the image of His Son." Therefore it seems that no other Person except the Person of the Son could have become incarnate.

❌ Objection 3 : Further, the Son is said to be sent and to be begotten by the temporal nativity, inasmuch as He became incarnate. But it does not belong to the Father to be sent, for He is innascible, as was said above (FP, Question [32], Article [3]; FP, Question [43], Article [4]). Therefore at least the Person of the Father cannot become incarnate.