I have asthma I have had it since I was 12, but you can grow out of it. I haven't had an attack for 2 yrs. My aunt grew out of it. Hopefully my little cousin will (he is 14), his is really bad and he is often in hospitle. One way to help is to build up your self up with exercise (not sure if I worded that right). I started out by doing a 5 min run. When I could do that with no problems I would go up by a minute. You find your limitations this way and prevents any attacks for a certain amount. I have got up to 20 mins. But then agin I am not a running sort of person, so Ithink that it quite good.
I am not saying this will work for everyone, but it may help your children, if they get upset because they cant do what all the other children do.