Mom has vascular dementia. She was caring for my sister with chronic disease for last few years until 2 years ago her dementia became so bad I moved in and started caring for mom. My sister passed away at the age of 33 in January..she was my only and close sister and I'm in so much pain. What has been even more difficult is that mom was feeling really bad these months and we were not able to tell her. One of her doctors said not to tell her, the other one said try to tell her when she is better. Mom asks about my sister all the time. I feel like she is more confused. Once she caught me looking at my sister's photo and she became sad saying:"she has not seen her long time." Before she would see her every other day. Sometimes in the evening she starts asking about her and demanding go and see her because sister is scared on her own. When my sister was in a hospital and my mom found that- I was on video with sister and she tubes in her nose and mom came in..when mom saw my sister's face with tubes , she became so agitated and started panicking and being relentless with worry. So i had to turn off the camera and lie to her and tell that sister is okay and with cousin now.. I was so scared to tell about her death.. so i did not tell. But I feel that mother instincts are there and she is feeling something. She is more confused. In the evening she is rummaging through her wardrobe looking for something , looking confused and crying. Before she immediately would go to bed. Last night she was standing next to the front door saying that she is hearing voices and those people saying that they took away my sister. And my sister is scared. She was having hallucintaions. I can see that she feels something is wrong but she doesn't understand what. But I cannot imagine telling her as i have seen how she panicked when my sister was ill..Shall I tell her or not ? Mom is 63 years old if that's helpful. We do not have any other relatives so decision is on me and I have to deal with consequences.