2 kids on their own in 1A/K should not be allowed if granny/nanny is not in 2A/K.
An 8/9 year old with their own DVD and iPhone? I think Dad is probably a super Prem.
Agree about badly behaved adults. I saw the person across the aisle and one row up answer his phone while the plane was taxi-ing to the run way. He ignored shouts by fellow pax to turn phone off. Crew were belted up and hidden. This was KLM.