Sticky Problem - Need Advice

[Waitinggent 2]

My Ukrainian wife arrived in late February on a K-1 visa, and her son has his interview in Moscow for his K-2 visa on August 25th. Her son's passport expires in September, so they traveled to Ukraine to get a new passport. The problem is that her son is still 17, so they will not issue him an adult passport, and the child's passport is only good until he turns 18, on February 11th. As I understand it, he must come here within 1 year of his mother's arrival, so we planned on him coming on his February break from the University, but this new passport will also be expired before he completes his visit to the USA. And also, if I remember correctly, his passport must be good for 6 months after his interview, and it will expire about 5.5 months after the interview. Any ideas???