New to this forum need advice. Hello i am new to this forum so please bear with me. Let me give you a little background, i am the youngest of ten children, my mother and father are Irish immigrants. My mom has told me stories of her mother dying from possible Alzheimers, but it was in the 50's in Ireland so it wasnt really a topic then. Here lies my issue, my mom is 79 and i moved 3 hrs away from her over 4 years ago. The past 4 years she has had some MINOR memory issues like anyone would have, loosing keys,ect. The beginning of this month is when it all started. My older sisters would call her in the early evening (yes im thinking sundowning) and she was saying that family members were in her apartment that were not there. This is so sudden and i want to know if anyone has ever heard or had any experience of such sudden onset of dementia? We did have her checked for a UTI but was negative. Her blood work was ok although her B12 was low but not low enough to cause hallucinations. We can not figure out what is going on with this being such a sudden onset? If anyone has any similar experiences please let me know as we are all kind of in denial and just cant believe its happening this fast.