Hi Suzanne, It sounds like you have a wonderful family to take care of your dad and anticipate his current and future needs. As a nationally certified Speech Pathologist, when treating dementia patients in my practice, I use reminiscing techniques, showing old pictures of the family members, vacations and images of places of the past are good conversation extenders. To deal with mood swings, hallucinations, etc., I personally recommend, not trying to correct his thoughts, or challenge him, but to speak to him calmly, and respond to him in his reality at the moment. By doing so, the current situation will dissipate and he will forget it. I recommend reading, The 36-Hour Day: A Family Guide to Caring for People Who Have Alzheimer Disease, Other Dementias, and Memory Loss
by Nancy L. Mace, Peter V. Rabins. Let me know how you are doing. Best, Marc M., ParkinsonsDisease.net, fellow Advocate