My brother passed away eight months ago. I didn’t share that with my elderly mom to spare her from devastation. Now she curses me every night because she thinks that I took him to the hospital and I am not bringing him back. She says that he called her and he is ready to be picked up but I am the one who refuses to bring him back. I explained to her numerous times that the ambulance took him. She goes back to her imagination. We are both frustrated. She has dementia and she keeps repeating herself. Any advice?