Adding minor children

Hello. I need your help. This is my post on this board. I submitted I-130 for my brother and his wife back in 2008. The petition was approved and sent to the local office few months later. We have not heard anything about it until yesterday when I received email from NVC titled "Notice of Immigrant Visa Case Creation". Between 2008 and now, my brother has two minor children. I am not sure how to proceed. NVC gives me an option to add additional applicants. Should we just add them there and proceed? Any guidance you can provide will be of immense help.
 
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