This dream may reflect feelings of betrayal and greed within your family dynamic. The presence of your mother and brother suggests a close relationship, but their actions in the dream indicate a desire to harm you. The scheme to steal your property and kick you out of their lives may symbolize a fear of losing your place in the family or being taken advantage of by those you trust. The sexual encounter between your brother and mother may represent a violation of boundaries and a sense of powerlessness in the face of their actions. The mention of your brother’s mental wellbeing suggests that he may be struggling with his own issues, possibly leading him to act out in destructive ways. Overall, this dream may be a reflection of your fears and anxieties about your relationships with your family members and the potential for betrayal and conflict.