Both parents are living in an assisted living facility. Mom has dementia that seems to be getting worse, Dad is in denial. Any suggestions?

Your solution is that Mom needs to be in memory care, and Dad stays in AL. Does their facility have both levels of care?

The beginning of being able to practically help them is to have durable PoA for him and/or your mom. Do you have this? Does anyone? If not, "someone" will be forced to pursue guardianship in order to legally make decisions on their behalf. This will either be someone in your family (and it is expensive) or it will be the county. There are no other options. So, can you tell us if you or anyone has PoA for them? This will determine the responses you get to your question. Thanks

Sounds like your dad may be taking out his anger and frustrations on you, or he just feels helpless and doesn't know what to do. I would definitely talk to the staff at the AL and see what they suggest. You can only do so much, and you certainly cannot make either of them "get better". At some point, you will have to tell your dad that you are very sorry about his and your mom's situation, but you cannot do everything nor can you solve his issues. If he continues to bother you at night, you may just have to turn off your phone. If he continues to get angry with you, then limit your contact with him if possible. Nobody has to take abuse.