NOOOOO! Airborne and Zicam! Feed him those, plus as many of the clementines as he can eat! Jeez... we CAN'T have him be sick at your grandma's house AGAIN! Maybe more garlic, too....

Teach him about yawning on the plane BEFORE his ears hurt so he can try to relieve pressure.... when it hurts will be too late.

Sounds like you're doing a great job with him, I'm so sorry he's such a bug magnet. Good luck and give everyone a big hug from me!