Unfortunately, the real answer to your question is that your brother's only clear "right" at this point is the "right to spend exorbitant amounts of money and days and weeks or months of emotional anxiety" trying to do something in Serbia. Presumably, the mother is not a US citizen and, since she is already gone and the baby was not born when she left, there isn't much that any court in the US can do. He can contact the US State Department and ought to find an attorney experienced in international custody cases to consult about the possibility of hiring an attorney in Serbia. While it is technologically possible to conduct paternity testing before a baby is born, that is an expensive process and it will require a Serbian court to order it.
Answered on Aug 16th, 2012 at 12:30 AM