A US citizen may petition their sibling for immigration benefits. However the wait time for a visa maybe as long as 10 to 12 years.
If your mother becomes a permanent resident of the United States she can file a petition on behalf of an unmarried children over the age of 21. This process also requires a significant time for a visa to be available.
I recommend consulting with an experienced immigration attorney to review your situation.
Disclaimer: Salvatore A. Falletta - 201 438-5625: This answer found here is general in nature. No attorney/client relationship is formed from this response.
The process you are talking about could take a very very long time, but in theory it is possible
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The simple answer is yes, your mother could apply for you, but the wait to become a permanent resident would be many, many years. Alternatively, you sister could apply for you, but again, the process would take many, many years. I suggest consulting with a local immigration attorney to see if there are any other options available to you.
Both your sister and your mother (once she has the green card) can petition for you. Both will take many years, however, for visas to become available.
Samuel Ouya Maina, Esq. 415.391.6612 email@example.com Law Offices of S. Ouya Maina, PC 332 Pine Street, Suite 707 San Francisco, CA 94104
Either of them could petition for you however it is not ideal as the process could take a decade or more. It would be best to talk to an immigration attorney to see if there are any other options you could explore.