NET
29 because those whom he foreknew he also predestined to be conformed to the image of his Son, that his Son would be the firstborn among many brothers and sisters.
Darby
29 Because whom he has foreknown, he has also predestinated [to be] conformed to the image of his Son, so that he should be [the] firstborn among many brethren.
KJV
29 For whom he did foreknow, he also did predestinate [to be] conformed to the image of his Son, that he might be the firstborn among many brethren.