He's grown farther from home, he's no father
He goes home and barely knows his own daughter

from Eminem – Lose Yourself Lyrics on Rap Genius

Meaning

Em purposely pronounces “farther/father” the same to juxtapose the two. Although he is indeed getting “farther” from home due to all these concerts and road trips that take him miles away, he isn’t even with his daughter enough to be considered a real “father”.

This could also be a reference to Eminem’s own father, who left him when he was only a couple of months old

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