But he shall acknowledge
nakar  (naw-kar')
acknowledge, could, deliver, discern, dissemble, estrange, feign self to be another, know, take knowledge (notice), perceive, regard, (have) respect, behave (make) self strange(-ly).

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the son
ben  (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.

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of the hated
sane'  (saw-nay')
to hate (personally) -- enemy, foe, (be) hate(-ful, -r), odious, utterly.

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for the firstborn
bkowr  (bek-ore')
firstborn; hence, chief -- eldest (son), firstborn(-ling).

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by giving
nathan  (naw-than')
to give, used with greatest latitude of application (put, make, etc.)

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him a double
shnayim  (shen-ah'-yim)
two; also (as ordinal) twofold -- both, couple, double, second, twain, + twelfth, + twelve, + twenty (sixscore) thousand, twice, two.

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portion
peh  (peh)
the mouth (as the means of blowing), whether literal or figurative (particularly speech); specifically edge, portion or side; adverbially (with preposition) according to

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of all that he hath
matsa'  (maw-tsaw')
to come forth to, i.e. appear or exist; transitively, to attain, i.e. find or acquire; figuratively, to occur, meet or be present

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for he is the beginning
re'shiyth  (ray-sheeth')
the first, in place, time, order or rank (specifically, a firstfruit) -- beginning, chief(-est), first(-fruits, part, time), principal thing.

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of his strength
'own  (one)
ability, power, (figuratively) wealth -- force, goods, might, strength, substance.

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the right
mishpat  (mish-pawt')
a verdict (favorable or unfavorable) pronounced judicially, especially a sentence or formal decree (human or (participant's) divine law, individual or collective

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of the firstborn
bkowrah  (bek-o-raw')
the firstling of man or beast; abstractly primogeniture -- birthright, firstborn(-ling).

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is his

Parallel Verses

New American Standard Bible
"But he shall acknowledge the firstborn, the son of the unloved, by giving him a double portion of all that he has, for he is the beginning of his strength; to him belongs the right of the firstborn.

King James Bible
But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.

Holman Christian Standard Bible
He must acknowledge the firstborn, the son of the unloved wife, by giving him two shares of his estate, for he is the firstfruits of his virility; he has the rights of the firstborn."

International Standard Version
Instead, he must acknowledge the firstborn of the unloved wife by giving him double of everything he owns, because he is really the first fruit of his father's strength. The right of the firstborn belongs to him."

NET Bible
Rather, he must acknowledge the son of the less loved wife as firstborn and give him the double portion of all he has, for that son is the beginning of his father's procreative power--to him should go the right of the firstborn.

GOD'S WORD® Translation
Instead, he must recognize the son of the wife he doesn't love as the firstborn. He must give that son a double portion of whatever he owns. That son is the very first son he had. The rights of the firstborn son are his.

King James 2000 Bible
But he shall acknowledge the son of the hated as the firstborn, by giving him a double portion of all that he has: for he is the beginning of his strength; the right of the firstborn is his.

Links

Deuteronomy 21:17
Deuteronomy 21:17 NIV
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Deuteronomy 21:17 ESV
Deuteronomy 21:17 NASB
Deuteronomy 21:17 KJV