This dream may symbolize feelings of betrayal and mistrust towards your older brother. The knife and scissors represent the potential for harm and violence, while the lemon squeezer could symbolize the manipulation and control your brother may have over you. The fact that you are trying to block him from hurting you suggests that you are aware of his intentions and are trying to protect yourself. The repeated attempts to call the police may indicate a desire for outside help or intervention in the situation. The stabbing in the back of the head could represent a fear of being blindsided or backstabbed by your brother. This dream may reflect underlying feelings of resentment or competition towards your brother, as well as a fear of being hurt or betrayed by someone you should be able to trust. It may be helpful to address these feelings and communicate openly with your brother to improve your relationship and alleviate these fears.