Your recitation of facts does not sound right: - if both parents of your son are in a diplomatic status, birth in the U.S. does not entitle your son to a U.S. citizenship [U.S. v. Wong Kim Ark, 169 U.S. 649 (1898)] and it, definitely, does not entitle him to a green card; - if your son's mother is a U.S. citizen or permanent resident, the child is a U.S. citizen by birth and is not eligible to receive a green card; - if your son's mother is in the U.S. on a non-immigrant visa and does not have a diplomatic status, the child might be a U.S. citizen by birth (USCIS can argue that your diplomatic status precludes your son's acquisition of U.S. citizenship under* *the 14th Amendment) but he is, definitely, not a permanent resident.
Answered on Oct 16th, 2013 at 1:41 AM