Tragic situation. It's also sad that your grandma didn't deed her house to you before her dementia set in.
Oh yes she did. It's even written in her will. My father and her went to her attorney and had it written into her will 10 years ago before the dementia set in. In fact, before she had her will revised, she promised me at the kitchen table over dinner one day that the house and everything in it were going to be mine someday. Her car has been willed to me. She is still alive, so legally, they're still hers, and I treat them as if they were hers.