My mother is said to have dementia. When I was younger she was sweet as can be. But as I grew up, she became increasingly bitter, Now anything will set her off. She has become mean and spiteful. I cook and clean for her on a daily basis and last week she told me that I was not her daughter and that she did not love me. I don't know whether this is her or the disease. I am so confused. I need to go take my parents a few things, but my father asked me not because he fears my mother. Please help me understand.