Forget the Infidel Grandma's rheumatism medicine! The religion of perpetual ignorance has the cure you need! Camel urine and hot sand will heal all that ails you!
(I guess I can give a Hat Tip to Brian for linking the picture in the last post!)
I hate to break it to you, but camel urine DOES cure many child illnesses. Just let them know in advance that if they get sick, they have to drink a cup of it.
I don't know whether camel urine can cure diseases. But I agree with Kevin. Let them drink not one, but three cups per day every day, and stay buried in hot sand for as long as they wish. If they grow thirsty and ask for a drink, let them have more camel urine. I am sure that if this doesn't solve their problems, it will solve ours.