Originally Posted by
BigFlyer
If that's what it means, that's a pretty amazing benefit. The rule could use a little more fleshing out - for the passenger being sick you need a note from a doctor saying you can't travel. Not clear what the note would have to say for a non-travelling family member.
It's something like a discharge statement from a hospital or doctor that shows that it is a real medical situation and not akin to your parents calling the school claiming that you're sick because you didn't want to go to school. People usually receive a patient summary/discharge statement if they go to the hospital in developed countries.