It depends, some people can never come back, others can come back with minimal issues. Why was he deported? Take his paperwork to a qualified immigration attorney and they will help you determine the best path forward.
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Legal disclaimer: The statement above is general in nature, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship.
There is one missing piece of information in your inquiry - Why was he deported? Also, are you a U.S. citizen? If so, you may be able to petition for him. The mother may already be able to petition for him, but he has to wait years before he can apply for an immigrant visa, and then the question becomes whether he is admissible to the United States based on his criminal and immigration history.
I recommend that you see an attorney in person. Good luck!
All depends on why he was deported. If criminally as an aggravated felon, then he can probably never come back. if for another reason, have an experienced attorney review his entire file and come up with the most appropriate solution. If you do not know why he was deported, makes sense to get his file
This is not legal advice and a client attorney relationship is not created. For a free consultation call (718)234-5588.
If he had a green card and was deported, there must have been a reason. Do you have the immigration court papers to determine the basis for his deportation?
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.