Hi I would be happy to help you in understanding your dream. Zombies in dream are usually symbolic. They can be representing the world or worldly things coming into your life that will cause unwanted emotions or situations to arise. With you taking a kitchen knife and stabbing them to protect your mother is showing how you are spiritually trying to fight to help her and yourself in yours and hers spiritual and personal life. With your dad and brother being separated can be showing how perhaps you are also trying to "reach them" but they seem harder to connect with or come to a level of agreement relating to certain beliefs, concepts or ideas. With you being evacuated to a high school gym is showing a place of learning and how you are exercising certain gifts or beliefs you may have. School bus is showing a transition in your learning. And back to the apartments can be symbolizing a temporary transition in your life and what you are going through and or are learning. With you sitting on the couch is showing "support" and with you wanting to play chess is showing how you are trying to get your family on board for this battle of knowledge you are trying to help them see or understand. With the end of the dreaming is showing how your brother and father will indeed take in what you are trying to show them. I hope this helps you. If you have any more questions do feel free to ask.
No problem at all. So glad to have helped. If you are needing any help with future dreams please feel free to request me. :-)