Keysey, as said before, the brain of most dementia patients doesn't let them know that it is damaged. What they perceive is their reality and they do not see anything wrong with what they believe. That is why you can not leave important decisions to someone with dementia beyond the early stages. The early stages are BEFORE you notice symptoms. When you believe there is a problem, there has been a problem for a LONG time. Dad's damaged brain is telling him he is fine and the rest of you have a problem. You have to believe what you know (that Dad has dementia) as strongly as he believes that he is fine
We think of dementia as Memory loss and that gets us into trouble. Dementia is progressive brain damage that is caused by a disease. It does not just affect memory. It affect every part of cognition. It causes poor judgement, irrational behavior, inability to follow instructions or know how to do something. Those with dementia lose their sense of place, time, and purpose. Then they forget. Dad didn't take a shower this morning because he didn't think he needed on and didn't have a clue how to do it. In his mind he didn't need one.. and then he forgets if he took it or not. You ask if he had a shower and he will probably tell you yes... and you think the world is good.
So while you go forward with bringing Dad home remember that you are only seeing the tip of the dementia ice burg that he is living. Your decision was the right one and now you just have to follow through....