Oops. My bad. Then he has an opportunity to put together a good application.
Yes, it's rather stressful especially when the odds are against him. But don't give up. Think positive. He might just get lucky
From what we've seen the Manila visa office tends to be a bit more sympathetic as compared to other visa offices.
I also suggest that your invitation letter has some emotional statements (just a bit) about why it's so important that her younger brother attends your wedding, and no one else. This may help.
Do give these points some thought and see if there's anything else you can add to his application:
It may help to take a break from thinking about this visa situation. And, after a day or two of switching off, you might just find a different way of going about this