I don't see a problem with it. Although I don't ever call anyone "brother", a good friend of mine does repeatedly.
As for "cracka"...
Quote:
Cracka - A term slaves used to identify the slave driver with the whip, because of the sound the whip made.
"Ya'll betta' get back to work, the cracka be a comin'."
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.. it's not really a term of endearment.