In all likelihood, your son will have the new priority date from your petition (the Supreme Court recently upheld the more restrictive holding on priority dates adopted by the government.
Your son may or may not be covered by the CSPA (Child Status Protection Act), or may have other options. Make an appointment for a detailed consultation with an experienced immigration attorney.
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The date USCIS receives the I-130.
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.