I am U.S national. I have a son from a Pakistan national lady without wedlock, he has obtained U.S nationality through C.R.B.A. My son lives in Pakistan with his mother and I live in U.S. Soon my son would be 3 years old and he needs attention, love and care of his mother and father both. U.S court has a law that separated parents can keep their child with them one by one by deciding and agreeing on some days of week but son is too far from me that I cannot go to meet him regularly. I want that my son would shift to U.S with his mother. Is there any visa category with which my son’s mother would be able to get residence to stay in U.S?