At 6 years old, he probably weighs less than 50 lbs. I doubt the balloon would have trouble lifting off with him in it.
Well, based on how many helium balloons it took fo the Mythbusters to get a kid a couple of feet off the ground, I'm thinking that balloon isn't NEARLY big enough.
We should send them a bill for helping us waste our time.
No joke, police out there, helicopters, and the whole thing looks like a big stunt cooked up by a bunch of exposure loving nutbars!