Watching dutiful Rockstar keeping the baby busy as I dry my hair...
Rockstar: Oh. Mum. I just thought of a problem in future.
Me: What's that?
Rockstar: What if she grows up and we both want the laptop? Or we fight over the tv?
Me: You guys are 4yrs apart, your schedules are going to be quite different, it's not difficult for me to arrange so you both have your time with the laptop without even feeling like you have to give up any time. You're going to be at school for much longer than her, initially.
Rockstar: Oh right so she can have the laptop while I'm in school.
Me: Yeah, but really it's going to be awhile before she even has that much interest - you got into Youtube because you learned to read. (This is true, his wind-down hobby is to search Youtube for things like Plants vs Zombies, OmNom or like in the last instance Madagascar when his friends come to school talking about it. The only one he actually decided to get into was OmNom, the rest he watches Youtubes of.)
Rockstar: I just thought of another problem. What about when she's 10 and I'm 14?
Me: By then you may not even still be into the laptop and Youtube. <Rockstar looks dubious> Or, you could get a part time job and make some money for your own laptop.
Rockstar: Nooo! I'm a child! Where would I ever get that much money?!
Me: Get a job.
Rockstar: Nooo! They're scary! <pause> Actually just banking jobs are scary.
Rockstar: It's like when they've made so many mistakes it's like they forgot how to make money. And then it's like their teachers have to say go and quit this job and find some other way to make money.
One of those times you kinda freak out at how come he can come up with these things...