The house/apt is already where you live, you're not moving to a new place to accomodate your brother... right?

I don't know what your rent is, but that seems like you would be taking advantage of someone who is down on their luck. I don't see how 1/3 is fair, but that's just me. I've had family stay with me, and never charged anything except their long distance charges. I stayed with my brother after my divorce and thankfully he never charged me 1/2 of his rent, I couldn't have paid it.

Maybe $200 and have him help with groceries?

Crystal