First have her look at the J-1 visa in her passport. It is probably annotated as either "subject" or "not subject" followed by a section of law. If it says not subjectt and your son is a US citizen, then great, go ahead and get married and go through the adjustment of status process being sure not to leave the country in the meantime, and being sure to consult with an attorney before you do anything to determine whether there may be other issues. If it says subject or if it doesn't say anything, you will need assistance to determine if she is subject and to get a waiver if she can. This is about the fact that most J visa holders are required to return home for 2 years before they're allowed to change or adjust status
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I agree with Ms. Mulder, assuming your son is a US Citizen, he can sponsor her for a "green card" and she can remain here. Ideally, she shoul file before she falls out of status, but she can obtain this benefit even if the J-1 expires. The process is fairly quick: 5-7 months from the date of filing. If your son is young and does not make too much money yet, he might need a financial co-sponsor.
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While I agree with my colleagues, I would like to add that, absent a waiver, your son's fiancée will still be held to the two year home residency requirement. The green card will not be issued unless and until the residency requirement is met. Seek the counsel of an immigration attorney if you would like to discuss the possibility of a waiver. For my clients, I find some countries are more amenable than others to approve.
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1) the son's status.
2) whether the South African citizen is subject to the two year foreign residency requirement.
You should retain an experienced immigration lawyer to review all the facts, advise you, and handle the case. You can find one through http://www.ailalawyer.com.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, 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. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.