Sometimes losing a firm touch with reality has a chemical basis. My mother started hallucinating at a certain point. (Cats sitting on the bedpost; her bed floating on a lake; her nurse so tall she had to bend her neck to fit under the ceiling) My Dad took her to a different doctor. Turned out she was taking seven different medications- all of them given by the same doctor -. The new doctor took her off three of them immediately and she never hallucinated again.

The best of outcomes for your dad. Still holding you all in the light.