Bah!. Just googled it and found some scripts, but none for automation. The ones I've found only make it easier to do the same things manually, so he'd still probably be up late. If you want though, here's what you gotta do:
1. Install a new browser, Firefox 3 from mozilla.com
2. Install the firefox addon called greasemonkey
3. Go to http://userscripts.org/scripts/show/31689 and install that.
4. Thats it. It will automatically alter the interface when you log in, or refresh the page when already logged in.
Odds are, this script is considered illegal gameplay, but not sure. I kind of glanced at it when it was installed, and didn't see anything too significantly different, but I don't know the game too much. I'm more of a Travian gamer. If you want to have a go at looking for scripts, be my guest, assuming you have access to Google. Just be creative with search phrases, and you may find something I couldn't. Either that, or you could just hide the computer from your bro, or maybe you could put a tiny bit of Nyquil(sleeping aid) in his midnight whatever he drinks when he's thirsty :) Just kidding, maybe. You kind of seem like the "cruel" sibling that may do that, considering you want to get him booted from the game. If that's the case, google for something like that. Hope I helped.
PS: the script is multilanguage, meaning it (should) work even if used at .ro. I do believe that's one of the standard languages.