I appreciated your response & wish u luck next time. By the way, is there any way that I could apply B2 visas for them from here instead from Nepal? If so, what is the process? All I know is,  one can apply for B2 visa online to the US embassy in Nepal ( http://nepal.usembassy.gov/visas/non-immigrant-visas/applying-for-an-niv-in-nepal.html).
Once again thanks for your response.