E.T.
I'm so sorry that you've had such awful experiences on airplanes. Does this happen every time you fly? Have you had your ears checked to see if you have a structural issue - like your ears are formed slightly differently? Your problem is so rare that it would be really surprising if your children had the same problem. It would have to be something genetic for them to have the same problem.
So... book the flights. Have a nice trip. And don't stress about this. Your kids will be fine.