Petitioning for Siblings
If I become a U.S. citizen, can I petition for a green card for my brother or sister?
Yes. Only a U.S. citizen age 21 or older can petition for a brother or sister.
Unfortunately, once you petition for your sibling, it could take decades for him to get his green card. If your parents are alive and want to immigrate to the United States, you may be able to get your brother or sister here faster by bringing them first and then having one of them petition for your sibling.
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Source: Allan Wernick, NY Daily News