Not all the facts were out and the error was perhaps leaping in, accusing the mother (parents - though father wasn't there) of negligence.
They were apparently all excellent and well-practised skiers....the girl loses a ski and mother stops to help her, the boy shooting along ahead, perfectly natural. What happened next is still somewhat opaque in how he became lost and removed his skis.
It is a tragic accident and one really can't blame the mother, even though she will be feeling like hell warmed up. I've seen enough of these sorts of 'sequence' accidents in walking and climbing in 'Mountain Deathcrew,' as we called it, but fortunately most involved injury and not death - except for a mate of mine who got pulled over Lochnagar cliffs by seven others in a white-out and he couldn't get them to stop.