Congratulations!! Now wait for the instructions that will be sent to your father by the Juarez consulate. Those will contain detailed instructions regarding what needs to be done to conclude this case and for him to finally obtain his immigrant visa and come to the US.
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Inform the consulate about it and they will call your dad for an interview.
New York Immigration lawyer. This advice does not create an attorney client relationship. No specific legal advice may be offered by the lawyer until a conflicts check is undertaken. Information sent through a web form or via email may not be treated as confidential. Please accept my apologies for spelling mistakes.