It means to continue to offer friendship or support to someone when they are in trouble or difficulties, and it would be easier to not help them.
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NL888Sticking by a Brother, and Paying for It DearlyRemaining loyal to someone, even if it means that bad things will happen to you.
NL888So "Sticking by a Brother, and Paying for It Dearly" means "Remaining loyal to the brother and paying high price for it"?Yes.