The house needs to be appropriated to the brothers equally (this is just a paper transfer) - that will have the effect of each of them "owning" one third (at the mo they only have a chose in action to have the estate properly administered and don't actually beneficially "own" any of the assets yet). The purchase price will then be the two thirds value - �180k ish. Don't know what the stamp duty is likely to be on that.
As long as he has lived in it for 6 months as his only home there should be no cgt on sale in 3 years' time.