Update after Christmas.
Hooray! I got my youngest son and new daughter-in-law to go visit Dad with us. We've put off our Christmas until Friday night.
He was very glad to see us, although he cried a lot. Mostly due to frustration that he couldn't tell us what he wanted us to know.
He made us take down his tree that my sister put up at Thanksgiving, and clear his corkboard of all birthday and Christmas cards and put them in a box. I think too much chaos and change of routine for him. He felt better after the board was clear of almost everything.
We had a problem though - a gift was a white open weave blanket, and he got very VERY VERY upset that it was in his room. After about 30 minutes of trying this and that, we finally figured out that he wanted it out of his room. The nurses seemed to think that it looked like the other blankets there and he's very particular about what leaves his room (like laundry). So they thought he was worried it would get lost. Anyway, after that VERY LONG TIME, and we figured it out - Dad and I both sighed real big and went "Whew!"
We tried to get him to understand that we'll get it eventually, not to lose patience with us as we try to figure out what he wants.
One funny thing - we were visiting in the lobby and my daughter-in-law started to rub his shoulders. After a minute, he leaned forward very slowly, and she started rubbing lower down his back. We looked up at Dad and he had this grin on his face I haven't seen in a long time. It was like "I got her where I want her!" Everyone cracked up.
Anyway, I was both discouraged that he seems to be getting weaker (won't exercise) and encouraged (that even though he cries a lot, you can tease him out of it easily.)
Thanks everyone. I'll keep checking back as I find out more about getting Dad evaluated.