Plus your mom call me son, around you since I was small
Shit, I watched you mature, nah, this ain't right

from Jay Z – Soon You'll Understand Lyrics on Rap Genius

Meaning

They grew up together since they were little

She’s more of a sister than a girlfriend

Don’t date your sister

Just to clear up speculation, this line isn’t referencing the movie Scarface. Tony’s mom never knew Manolo and Manolo didn’t know her when she was younger. While this may allude to Scarface, Jay is talking from an introspective general scenario where he may have been friends with the girl’s brother from a long time ago.

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