Kids sail free promotion?

[Leroyr55]

I just did two mock sailings including my seven year old grandson in it. Both times there was a price included for him. So they don’t sail free? I can understand port fees being included. 

[AspiringCruisePlanner]

The cost breakdown shown on the Royal Caribbean booking confirmation page doesn't show all the discount details well.  The 100% discount for your grandson is included in the line titled "30% Off" along with the 30% off discount for everyone else.