Both of your posts make so much sense, and you may be right.
But there's much more to psychiatric impairment than just dementia, and I find myself leaning more and more toward that possibility.
Could he have been on prescription medications and got the doses all mixed up?
This happened quite often with elderly patients on our unit. They didn't have dementia but they just weren't sharp enough to keep their medications straight.
They often came in with a shoebox full of prescription meds! Anyone would have trouble keeping up with that many medications, much less an elderly person, especially if they had impaired vision and trouble reading the labels.
These people ended up taking extra doses of one med, omitting doses of another, and really had no idea what they were doing. Yet they were still oriented. They knew who they were, where they were, and even why they were there.
They'd tell us point blank. "I can't keep these dang pills straight." They even realized they were in grave danger from mixing up their meds so badly.
So many other things too can affect their mental functioning. Poor sleep to the point of going without sleep for days. Was he up with Roberta at all hours if she was that sick herself? Poor nutrition, was he eating?
There's also a disorder we saw called Brief Psychotic Disorder. Here is a link that describes it if anyone wants to read about it.
https://www.webmd.com/schizophrenia/guide/mental-health-brief-psychotic-disorder#1
It's not Schizophrenia. It's basically a short term psychosis that can result from a reaction to major stress, such as a death of a spouse. It can cause hallucinations and delusions, but fortunately, is not permanent.
I'm not giving Philip a mental illness pass yet; there's so much we don't know. But for the time being, I am leaning that way myself, and just throwing it out there for consideration, at least.
In case he is dealing with any of this, I'd like to give him the benefit of the doubt...
JMO