Sure you can. It is one of the privileges USCs have. They can petition for immigration of their siblings. To do that you need to turn 21. Once you are 21, you will be able to petition for the sibling. The case will take decade plus in waiting but eventually he will be able to immigrant even if married and with the family. The entire family will be able to immigrate.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
You will need to have copies of both you and your brother's birth certificates to prove that you have the same parents. Good luck!
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