Please know you’re doing the best you can. Know it’s common to have those thoughts and feelings but remind yourself you are doing the best you can. I have a few recommendations. I would always “meet your dad where he is.” For example if he talks about living with his wife that is dead. You should talk about her. Say things like oh you just reminded me I have mom’s sweater. I need to give it back to her. If you tell him she passed however many years ago he will most likely get more paranoid and not trust you because you’re crazy and making things up or he is going to mourn her loss as if it is the first time he is hearing this because right this moment it is the first time he is hearing that she passed. Your concern about his leaving is valid. I would maybe get door cameras installed or have a stop sign on the front door or other deterrents to leave. You should also inform the local police and fire that your dad has dementia and may wonder and give them his picture. You can find many products online that can “track” him for example the find my friends app on an iPhone or a tracker watch made for people with dementia or a tracking key chain if you think he will bring his keys. Have medical info card in his wallet and jacket pockets in case he wonders. To help with sun downing I would make sure he is not to hot/cold in the house, hungry, thirsty, has to go to the bathroom, that the lights are on in the house, etc. make sure he is staying awake during the day so he sleeps at night and try getting him to be active during the day so he is tired. Have the aid put on calming music before she leave and use a lavender oil diffuser. These are calming. Or Have a list of things that he needs to do before the next person comes. I can share more ideas about any of these or other topics.