you're actually glad that your child is sick so that you can stay home.
(Did I just type that out loud?)
ETA: My daughter is going to be fine. She was running bit of a temperature, but is perking up now after a day resting and watching "Spy Kids" and "The Adventures of Shark Boy and Lava Girl." I just want to clarify (mostly to myself) that I would not have been glad if she had been very ill.