Our weather right now is usually cool at nights but warm by noontime. We almost have to change clothes 3 times a day to stay comfortable. Everyone has the sniffles and cough that accompanies temperature fluctuations. For every reason you could tell me you shouldn't come, I can give you twenty for why you should come. Everyone's parents come while they are stationed here.
People do it all the time.
I doubt it. It would just make them appreciate you that much more. Airplanes do not crash over the ocean. If you are worried about motion sickness, just get a Transderm D patch that you put behind your ear. They work even better than Dramamine, don't make you drowsy and last for 2-3 days.