Only through a bona fide marriage or he has to wait for the son to turn 21. Possibly if we are all lucky, maybe there will be an immigration reform before then.
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If he is married to a US citizen she can petition for him, otherwise he should wait for his son to turn 21.
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