Even filled with helium that thing is not big enough to carry a 6 year old boy..... Emotion up intellect down.
I disagree with you. that balloon was maybe 20ft around so a little math.
20-foot balloon has a radius of 10 feet. 10* 10 * 10 * 3.14 * 4/3 = 4,186 cubic feet of volume. 4,186 cubic feet * 28.2 grams/cubic feet = 118,064 grams. 118,064 grams / 448 grams per pound = 263 pounds of lifting force.
6 year old boy = 50-60 pounds
Flushed
