Do you think it's okay if I pretended to have a broken leg in the hospital so my brother could leave?
Why do you want your brother to leave?
He cried like a baby because he wasn't allowed to fly.
You shouldn't fake broken legs. That's not funny and you shouldn't lie about that.
It was only for this one time.
It's good you were trying to help your brother, but faking something so serious could worry your doctor and nurse taking care of you. You can always request to be discharged and released if you are showing no further symptoms.