Double Trouble - New to the group

I moved back to NE from Florida almost 3 years ago. I knew before I moved to Florida that my mom’s memory was getting increasingly worse. Once I moved back, I realized just how bad it had become in that short amount of time. We were able to get her to a neuropsychologist and have her tested. She has Alzheimer’s. Unfortunately, my dad also had dementia, just didn’t know what kind because it had been so many years since he was tested. He recently got tested and I just found out October 8th that he, too, has Alzheimer’s. His Dr actually made home mentally incompetent to make any financial or medical decisions. So now, I am the only legal adult in the home. I live with my parents in their basement. I’ve basically turned it into my own apartment. I am a RN and have been for almost 30 years. I’ve worked in many different fields, including hospice. I do have an older brother, but he lives in Canada. Ever since my dad’s diagnosis I have become very overwhelmed and very depressed. They have now both been given a very long terminal diagnosis. I am going to try my best to keep them both at home with me. My mom’s mentality is about that of a 4 year old and my dad is maybe 8-12 years old. I’m at a loss. I really don’t know anyone who has both parents diagnosed with this horrible disease. It’s bad enough with one, but both is seemingly impossible. Not sure what to do.