What does this dream mean?

The walls of the room are your boundaries in life. The water holding it's shape is your emotions. Water flows like one's emotion. The ramp could represent your path to your future. Your bother being where it will lead. The feelings you have in your dreams often tell you how you feel in your subconscious. Do you feel that you have somehow treated your brother unfairly? If so perhaps you should solve the problem before it turns the wrong way (as shown by him shooting you). As for your Grandma's Kitchen, that is simply your safe place. A place in which everything just seems right.