My Mom is 90 with vascular dementia, and I also suspect some Lewy Bodies. The vascular dementia was diagnosed after a CT scan, and a lot of people seem to know a lot about this type of dementia.
My Dad has not been diagnosed, but the suspicion is that he has Frontal Lobe dementia, probably bvFLD:
http://www.alz.org/dementia/fronto-temporal-dementia-ftd-symptoms.asp
http://www.alzheimers.org.uk/site/scripts/documents_info.php?documentID=167
It’s a nasty type of dementia, leaving more memory and physical function intact (at least initially), and taking away the ability to process information in the way a reasonable person would, or even in the way a person with a more obvious form of dementia would. It’s a deceptive type of dementia, because Dad appears to have facility, until you scratch that surface, and then it all starts unraveling. He used to be able to fool people, but now I don’t think it takes too long before he has anyone scratching their head. I don’t have the facility with words to describe how different it is from my mom’s dementia, but it’s very different.
I received a call from the sheriff today. He tried to walk to the care facility where Mom is. After being stranded for about an hour not far from home, some person called the sheriff to come help. That was probably the best part of the afternoon, sigh.
Long story short, I had to tell him today that Mom isn’t going to be coming home, and, the unfortunate follow-up, that, yes, this is where she is going to die. As someone that thinks being home lying in filth and not being fed regularly is a better option, this did not go over well with him, and he had a look of horror. There was no way I could make it better, as my name is mud with him right now, and I’m sure now and forever. I think today our relationship crossed a line, as he tried every which way he could to try to hurt me, and things have gone from bad to worse. I didn’t take his bait, but whatever was left of my father, I fear is gone.