I agree that your FIL should have a complete physical at this time.

Not to scare you, but my aunty, who had full mental faculties until a ripe old age, began having flashbacks to her life and thinking they were happening in the present. It was the first sign that some dementia was setting in, along with some paranoia as well. She was certain that the nursing home was video taping her every move and listening in to her conversations. She also believed that what she didn't eat at a meal would be given to her at the next meal. Of course this was not the case. It was sad and scary to see her going through all this as there was no way to console her or comfort her.

I pray that you are able to get him to a doctor for a physical, and please tell the doc ahead of time what is going on so he/she can ask the pertinent questions of your dad.

Good luck with everything and keep us posted!

Hugssss
J