Do you think your dad may be developing Alzheimer's or other dementia ?? My grandmother passed away from complications of Alzheimers and one of the events or traits was that she thought people were after her and/or robbing the house. It was us - she didn't recognize her family and even taking her to church services was upsetting for her because we were "taking her" or "after her". Which of course was ridiculus as we loved her tremendously. It wasn't her speaking, it was the disease.

Any chance you can suggest an evaluation ?? Perhaps on the pretense to getting that head bump looked at, perhaps you could speak with his doctor ??