Grandfather ran numbers a criminal in Harlem
The only thing he used to make was trouble and my father

from J. Cole (Ft. Childish Gambino & Spencer Datt) – Who Datt Pt. 2 Lyrics on Rap Genius

Meaning

Donald Glover’s grandfather was a straight up criminal, so all he did was make trouble. He also “made” Donald Glover’s father, who then “made” Donald Glover who is making the music world a better place. Also running numbers was an old fashioned form of illegal gambling in the great depression that was rampant in harlem.

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