I just returned from.Sydney. I also travelled by Qantas. All movies are ENGLISH, no Cantonese. There is USB on each seat. I also redeemed the tickets from Asia Miles.if your child is under 12, you can call them to arrange seats for yours. if your kid is over 12, they would not arrange in advanced.
my son is 12 years old, finally we were sit together.
We were very lucky, the flight was not full, four seats for 3 people. We enjoyed the flight time.
No wifi on the plan. USB only. No other socket. I don't think u need to bring laptop to your son. Does he always play games? Maybe u bring iPad or mini iPad if necessary.
My son played toys when he was four years old. I did not give him electronic games. U try to ask him to watch cartoon movie. I think he is ok.