Suggestion:
Your question is not very clear at all, but I think I know what you may be getting at.
Are you trying to build/rebuild credit? If that's the case and your brother has good credit, he can include your name on his cards and his credit score greatly helps yours.
I thought I heard that this was going to be illegal at some point, but I'm not sure.
It can really help you if you never had credit, because his score becomes your score.
The other thing you can do is purchase some big ticked item and have him cosign on it (if he;ll let you).
Paying off that balance will give you some credit.
Hope this helps
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Fair Issac changed the formula and authorized user accounts will show up on your credit report but only count in the scores for spouses and children. I'm not sure if a sibling counts or not. But it might not.