Well I’m sorry but you are incorrect, Christ was both Priest and King by genealogy. His mother was Mary; Mary’s mother was the sister of Elizabeth who was married to Zacharias. Zacharias was a Levitical priest of the course of Abia and serving in the Temple which means he had to be married to a full blooded Levite. Mary was then ½ Levite and ½ of Judah. Christ is both Levite and Judah.
Psa 110:4 The LORD hath sworn, and will not repent, Thou art a priest for ever after the order of Melchizedek.
H4442
מלכּי־צדק
malkı̂y-tsedeq
mal-kee-tseh'-dek
From H4428 and H6664; king of right; Malki-Tsedek, an early king in Palestine: - Melchizedek.
Zec 6:12 And speak unto him, saying, Thus speaketh the LORD of hosts, saying, Behold the man whose name is The BRANCH; and he shall grow up out of his place, and he shall build the temple of the LORD:
Zec 6:13 Even he shall build the temple of the LORD; and he shall bear the glory, and shall sit and rule upon his throne; and he shall be a priest upon his throne: and the counsel of peace shall be between them both.
Heb 5:1 For every high priest taken from among men is ordained for men in things pertaining to God, that he may offer both gifts and sacrifices for sins:
Heb 5:2 Who can have compassion on the ignorant, and on them that are out of the way; for that he himself also is compassed with infirmity.
Heb 5:3 And by reason hereof he ought, as for the people, so also for himself, to offer for sins.
Heb 5:4 And no man taketh this honour unto himself, but he that is called of God, as was Aaron.
Heb 5:5 So also Christ glorified not himself to be made an high priest; but he (God) that said unto him, Thou art my Son, to day have I begotten thee.
Heb 5:6 As he saith also in another place, Thou art a priest for ever after the order of Melchisedec.
Heb 5:7 Who in the days of his flesh, when he had offered up prayers and supplications with strong crying and tears unto him that was able to save him from death, and was heard in that he feared;
Heb 5:8 Though he were a Son, yet learned he obedience by the things which he suffered;
Heb 5:9 And being made perfect, he became the author of eternal salvation unto all them that obey him;
Heb 5:10 Called of God an high priest after the order of Melchisedec.
Heb 5:11 Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.
Heb 5:12 For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.
Heb 5:13 For every one that useth milk is unskilful in the word of righteousness: for he is a babe.
Heb 5:14 But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
Heb 7:1 For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him;
Heb 7:2 To whom also Abraham gave a tenth part of all; first being by interpretation King of righteousness, and after that also King of Salem, which is, King of peace;
Heb 7:3 Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.
Heb 7:4 Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.
Heb 7:5 And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham:
Heb 7:6 But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.
Heb 7:7 And without all contradiction the less is blessed of the better.
Heb 7:8 And here men that die receive tithes; but there he receiveth them, of whom it is witnessed that he liveth.
Heb 7:9 And as I may so say, Levi also, who receiveth tithes, payed tithes in Abraham.
Heb 7:10 For he was yet in the loins of his father, when Melchisedec met him.
Heb 7:11 If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron?
Heb 7:12 For the priesthood being changed, there is made of necessity a change also of the law.
Heb 7:13 For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.
Heb 7:14 For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
Heb 7:15 And it is yet far more evident: for that after the similitude of Melchisedec there ariseth another priest,
Heb 7:16 Who is made, not after the law of a carnal commandment, but after the power of an endless life.
Heb 7:17 For he testifieth, Thou art a priest for ever after the order of Melchisedec.
Heb 7:18 For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof.
Heb 7:19 For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God.
Heb 7:20 And inasmuch as not without an oath he was made priest:
Heb 7:21 (For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)
Heb 7:22 By so much was Jesus made a surety of a better testament.
Heb 7:23 And they truly were many priests, because they were not suffered to continue by reason of death:
Heb 7:24 But this man, because he continueth ever, hath an unchangeable priesthood.
Heb 7:25 Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them.
Heb 7:26 For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens;
Heb 7:27 Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself.
Heb 7:28 For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated for evermore.
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WK, was Christ working as a carpenter during His ministry? In fact where does Scripture say what Christ was doing after age 12?