What's wrong with that? He's still going out, still doing well at school, ... I don't see a problem with him coming home and unwinding; we all need to unwind and have our own space. OK, getting him fit is a good idea... find something fun that he might like, like sports. Perhaps his parents could get him involved in an active group or something. Going on the computer and playing games does not mean you'll end up one of THOSE people. I did exactly what your brother did, I've had relationships, I've just started a college course, I workout, I play the guitar, etc... I'm 28... we're not all THOSE people. I went on games so much to get away from reality... I was bullied lot at school and was going through lots of crap in my head that scared me and nobody understood any of it; maybe he's got some issues he's running away from. As long as he's not totally isolating himself all the time, then I wouldn't personally feel especially alarmed, but... you guys (mainly his parents, to be fair) know best, or at least should know best. xD Best of luck. I wish my sister bothered to look out for me when I was a kid, but she didn't give a damn!

By the way, there are many ways to block computer activity. There's bound to be plenty of different applications out there that lock your computer at a certain time, or give you a gaming quota or something. An easy one is to set up a batch file that initializes the "shutdown" command at a specific time, but it's very easy to get around, if he knows anything about CMD.

He does, he games; that's what he enjoys, and you say he draws and reads, too. Honestly, he sounds like a normal kid to me. He's likely got some puppy fat on him; that'll go eventually. I was the same, then ended up getting in shape, and eventually got into weight lifting and cardio stuff. Funnily enough, I am now a bit overweight, but that's because of mental health crap... still working out heaps, though!

Also, a computer guy. and also built my own gaming rig, ... but I'm still not one of THOSE people. Granted, I've been close, but I put that down to my mental health. (OCD, anxiety, and depression for as long as I can remember) Still, ... wish I went out more, or felt like I could've... ah well. When he starts ditching everything for the games, then you know there's a problem, ESPECIALLY if he lets his education slide, that's when he needs intervention, IMO.