# those whom he foreknew

"those whom he knew before he even created them"

# he also predestined to be conformed

"he also planned in advance that they would be conformed"

# to be conformed to the image of his Son

You can translate this in an active form. Alternate translation: "that he would change them to be like his Son" (See: [[rc://en/ta/man/translate/figs-activepassive]])

# Son

This is an important title for Jesus, the Son of God. (See: [[rc://en/ta/man/translate/guidelines-sonofgodprinciples]])

# that he might be the firstborn

"so that his Son would be the firstborn"

# among many brothers

Here "brothers" refers to all believers, both male and female. Alternate translation: "among many brothers and sisters who belong to the family of God" (See: [[rc://en/ta/man/translate/figs-explicit]])