Initial Interview for permanent residence documents required.
3 attorney answers
If she has all of the birth certificates, she should take them. If not, and if she can't get them easily before the interview, just take the one for the petitioner. If the Officer wants to see the others, he will ask her for them and give her time to provide them. They should not be necessary.
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Best to bring certified copies of all her children's' birth certificates, if she has them handy and have them with her, should those be required during the interview, which I doubt. Should the officer request them during the interview, she can always order those later, if need be. The only original or certified copy birth cert. she must be sure to have on her, however, is the one of her son who petitioned her for the green card.
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Take all or as many of the documents that are listed on the interview notice. Make sure that the birth certificates are originals, she should also take a copy of each. If she cannot get the original birth certificates in time for the interview, make sure she lets the officer know that she tried getting all the original birth certificates but they will not be available until X date.