We will be flying in June to WDW from Houston. We will be traveling with our nephew (9), niece (7) and daughter (16 months). Is there any advice you can give me with traveling with these 3? They've never been on a plane before. Is there anything you can do or buy to help with their ears? Do you suggest I take advil or motrin for them in my carry on in case they end up getting a headache or anything?