If they were experienced boaters, I'd say it was nice that they were teaching their kids how to (hopefully) properly handle a boat and read the water.
But, since they're new, they need to concentrate on learning on their own first. There are no "roads" on the water, things can come at you from any direction. Until you learn how to properly navigate and handle yourself in that environment you shouldn't be turning the controls over to a child.
For a specific "what to say", I'd suggest something like "I saw the picture you posted, just wanted to let you know that it's illegal for someone underage to operate a boat and the MP's have been known to give out tickets for that sort of thing. Posting evidence of the incident is probably not a good idea either."
I'd also probably mention "I would have guessed they would have covered this in your boating safety course, but maybe not! Let me know if you have any questions about boating rules/regs and common courtesy stuff on the lake."
__________________
[insert witty phrase here]
|