The reason I am writing here is that i want know if there is anything I can do to get those lost coins back ?
No. You can wait and see if MtGox comes back up or offers its users their funds back. Most feel that is unlikely to some extent.
Bear in mind there have been a lot of wild theories posted here as fact, so don't believe anything unless it's clearly marked as speculation and you agree with the basis for the speculation, or else you have found a verifiable source for it.
would getting a lawyer and filing a lawsuit against MT.gox help?
I imagine it would certainly get MtGox's attention, which may help. I haven't yet heard of a successful prosecution in a bitcoin dispute but it would be good news to see one as then we'd know that bitcoin is considered an asset in law. Your trouble may come in
- Explaining to the lawyer what bitcoin is and how 1 of them is worth about $550 today, so 27 represents a loss of about $14.8k.
- Getting the lawyer to agree to sue a company that is based in Japan.
Is there any other tips or tricks for getting them back ?
There was a company called bitcoinbuilder that were offering to buy up your goxbtc for a rate of less than one btc each, but I don't think they are in operation since today. People did get funds out that way.
Your brother may have to take this as a very expensive lesson in not using an exchange like a bank.

Finally, donation addresses don't go down well.
I have been reading throughout many posts in the forum and everything seems to be like you said just wild theoris, so if I want legit information about the MT.gox situation what news-site should be reading on to know for sure that this is actuall info.
but if bitcoinbuilder was buying goxbtc then that means there still is hope for the lost btc, why else would a company go in and buy it?