Like Ricktoronto I find your post hard to understand. I think in a roundabout way you are saying is your friend wants to get the two children from the D.R. to the U.S.
If that is the case, I don't know how good this friend is of yours. I suspect they want you represent (sponsor) them to obtain the U.S. visas for the children. It would be very charitable of you to do so. But, it involves financial and other responsibilities.
Don't show or give anybody any of your financial records until you find out what is really happening with this family, seek an independent confirmation. You may be the target of a scam. Your mutual friend should also take heed.
I have posted a website for you to see the rules and responsibilities of a sponsor.
http://www.usvisanews.com/memo18.html