Yes, I am still here. Sorry about that. But I am working with several customers at the same time, so delays are inevitable. Please note it was 30 minutes after I responded to you before you provided me with the answers to my questions. Also, each time you post a response, your question goes to the bottom of my list, causing further delays. My apologies for any inconvenience this might have caused you. I thank you for your patience and understanding.
ANSWER: In order to get another visitor visa, their parent with custody has to file an application for visitor visa - DS-160. Here is all of the information you need to get them a visitor visa: https://travel.state.gov/content/visas/en/visit/visitor.html
OR, if you want them to get immigrant visas to come to the US as permanent residents and get their green cards, you need to file the I-130 petitions, let is process in the US, and then go to the national visa center and the US consulate, which issues the immigrant visa.
At the national visa center stage, you will be asked to submit an I-864, Affidavit of Support. They will need to have immigrant visa applications filled out and filed (DS-260).
They also may have to undergo a medical examination before getting their visas.
Here is information on the immigrant visa process: https://travel.state.gov/content/visas/en/immigrate/immigrant-process.html
Now, if they get immigrant visas, they will enter the US as permanent residents and will get green cards within 4 to 6 weeks.
I know this can be confusing. If you want a 30 minute phone call to discuss this or anything else, let me know. I can send you an offer for that.
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