Need help

Ok someone has pissed me off bigtime. Right my bro is 12 goes on runescape, well just going through that phase right now and he was getting his stuff ot of his bank and he got logged out. Now there is only 2 people that know his password. His "Mate" and him. Now his mate only knows the password ecause he saw my bro typing it in. Now also my other bro 10 years old also plays Rs and he has been playing for quite a bit now and he had quite a bit off stuff and had just bought member on his account. Also my bros "Mate" knew his password cause he watched him type it in. Know my bros "Mate" has taken both their accounts. I know wanna get him back big time. If you guys can help me getting him back i can get his I.P address by a script i found and he has also had a new laptop i would like to trash. Please if you guys could help me you dont know how much i would be appreciated.

Yours, .-=m1k3y=-.

So basically you want us to teach you how to how his comp for stealing your brothers' runescape account?