Brother will only be able to file an immigrant petition on your behalf once he becomes a US citizen. A sibling's petition takes between eight and 18 years to be processed, depending on your country of birth, and you will not be able to stay in the US during that time period, unless continuously on valid work work visas.
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You cannot immigrate to the United States through your brother at this time based upon the facts that you have provided. There may be another way by which you can immigrate to the United States, but you would have to speak with an immigration lawyer in order to know. Good luck.
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The law doesn’t provide a Visa Category for Lawful Permanent Resident (LPR) to file for siblings. Your brother MUST become a US Citizen before he can file an Immigrant Visa Petition on your behalf.
In any event, due to the long waiting period for a green card number in this category, you will not be able to concurrently file for your green card in the United States and will need to wait outside the United States for the green card number to become current. (Unless of course, you are in the US in a valid status such as an H-1B, L-1 and the like, which will allow you to wait here for the number). Good luck.
First, your brother has to become a US citizen. Then, he has to file I-130 petition for you. Then, you need wait for the priority date to become current which takes around 10 years....
New York Immigration lawyer. This advice does not create an attorney client relationship. No specific legal advice may be offered by the lawyer until a conflicts check is undertaken. Information sent through a web form or via email may not be treated as confidential. Please accept my apologies for spelling mistakes.
I-485 cannot be filed until your priority date is current. Your sibling can file petition upon becoming a citizen. Then you wait for your date to become current. If you are in US, you have to maintain an alternative status all these years while you are waiting (may be a work visa - It is not that easy as it sounds.) If you are outside US, you apply for immigrant visa, when your number is available. Note here - they may not let you in B visa, once an immigrant petition is filed.
It is also important to note that you cannot adjust status (apply for your permanent residency in the United States) unless you have maintained a lawful immigration status during the entire time you have been in the United States. If you fall out of status or work without authorization while in the United States, you won't be able to file your application in the United States. I agree with the other responders that your best course of action - in light of the very long wait times for a sibling petition - would be to return to your home country and process through the US consulate once your priority date becomes current.