I have read the first 4 pages of this thread and the last page and I have a question:

Knowing that they have a child who is prone to travel sickness, why on earth did his parents not take precautions against it in advance? One visit to their own doctor and a prescription for medication against motion sickness would have prevented this whole sorry episode.

Dubai to Australia is a long, long journey. To make it with a sick child would be horrible.

I know that I am prone to motion sickness. I always take medication to prevent it and I have never been sick on a plane,no matter how much turbulence the flight has.