And look, tell me you ain't did it then you ain't did it
And if you did, then that's family business

from Kanye West – Family Business Lyrics on Rap Genius

Meaning

If a relative tells you that he is not guilty, then that’s the end of the conversation — you take him at his word. But, if a relative admits to committing the crime, such admission is the business of the family and no one else’s

Indeed, one does not snitch (especially on family…)

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