Had even thought that he had mini stroke, but then seemed ok. I told his Dr. He thought he had met his new great grandson (long distance) last year but baby hadn't been born yet. Then, few other things. Seemed fine, till recently when landlord said we haven't been paying right. They increased it, said we payed new amount since March, but for 3 months, back to the old amount. I called him he gave me check #'s and I can't find it in our check ledger. He claims he forgot new price. Maybe memory issues happening or was there a mini stroke, before? Otherwise he pays bills fine.
Get him to his doctor and find out for sure what is going on. There are meds he can be on and you need to know what you face in the future.