I am so sorry for the loss of your mother. I agree with neelamishi... See if there is a counselor you can speak to, your father and grandmother are probably having a hard time dealing with with her passing, and though that is not an excuse for how they are treating you, they might not be aware. Try sitting down with them and explain how you are hurt by how they talk to you sometimes. Maybe family grief counseling would help also. Good luck, and I hope things work out for you at home eventually.