His last memory of his son is seeing me through his rearview

from Slaughterhouse (Ft. Ida) – Goodbye Lyrics on Rap Genius

Meaning

He works with the idea of how when you see something out of a rear view you are leaving them, like a son leaving a father for college. In this case, though, it is the father leaving the son.

He’s also looking back at them through his rear view while driving away from them.

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