I am not sure what your exact situation is. Is one of you a US citizen and another one a green card holder?
Contact immigration attorney Gintare Grigaite, Esq. at 646-407-2331, located in New York and New Jersey. Answers on AVVO do not constitute legal advice and do not form attorney-client relationship. Always consult an attorney for a legal advice.
If he's had his green card for 5 years or more, he can apply for his US naturalization. Consult with an immigration lawyer if he has any criminal issues that may raise issues with his application.
Best of luck.
Verdin Law Firm, LLC
He can apply for citizenship
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