Answer:
I have a brother. However much we run we do not reach each other.
Take off my skin I won't cry but you will.
I'm the source of all emotion but I'm caged in a white prison.
I hold two meanings. With one I may be broken with the other I hold on.
I spend the day at the window go to the table for meals and hide at night.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.