GOD'S WORD® Translation
A man might have two wives and love one but not the other. Both wives might have children, and the firstborn son might belong to the wife that the man doesn't love.

American Standard Version
If a man have two wives, the one beloved, and the other hated, and they have borne him children, both the beloved and the hated; and if the first-born son be hers that was hated;

Berean Study Bible
If a man has two wives, one beloved and the other unloved, and both bear him sons, but the unloved wife has the firstborn son,

Douay-Rheims Bible
If a man have two wives, one beloved, and the other hated, and they have had children by him, and the son of the hated be the firstborn,

English Revised Version
If a man have two wives, the one beloved, and the other hated, and they have borne him children, both the beloved and the hated; and if the firstborn son be hers that was hated;

King James Bible
If a man have two wives, one beloved, and another hated, and they have born him children, both the beloved and the hated; and if the firstborn son be hers that was hated:

World English Bible
If a man have two wives, the one beloved, and the other hated, and they have borne him children, both the beloved and the hated; and if the firstborn son be hers who was hated;

Young's Literal Translation
'When a man hath two wives, the one loved and the other hated, and they have borne to him sons (the loved one and the hated one), and the first-born son hath been to the hated one;

Deuteronomy 21:15 Additional Translations ...