How do I know the difference between dementia and just being cranky and miserable?

You mentioned that he is "Unwillingly" in a alf. How long has he been there? Has he ever really gotten settled in? I have seen many posts on this forum advising caregivers to pull away for awhile, don't visit or call everyday. Seeing family members all time time will remind them of their anger about being moved. Give him some time.

Thanks everyone. I have always been on the anti-medicating sign of things (not anti-vaccine!!), so I am a little nervous about this but I will start researching. Thanks for the advice :)

Dementia can cause anxiety and anxiety can cause the personality changes you see in your dad.

Or, your dad may be aware of the changes in his brain and is scared and that fear is coming out as anger and feeling crabby.

When your dad asks the question, "It isn't March anymore?" and discovers that it's actually July that might be pretty scary. I know it would scare me.

I agree with Sunnygirl when she suggested you explore some medication for your dad. Get him to the Dr. and see if the Dr. can't prescribe a mild anti-anxiety medication and/or an antidepressant for your dad.

It's difficult to say, but you might have his doctor ask some questions that could indicate just how much the dementia has progressed, if that is needed. Regardless of his dementia, if he is miserable, depressed or having anxiety, I would explore medications to get him on something that will help him feel better. There are a number of options. My loved one really benefited from meds and most of her negative feelings has gone.

Of course, maybe you dad has valid complaints. I'd see what he is upset about and try to fix it, if it's an actual problem. See if he isn't getting the foods he wants or his clothes are not comfortable. Try to honor his wishes, with the understanding that they may be his dementia at work.