My mom died of classic Alzheimer's in July. Dad, 91, has never exhibited signs of dementia and while frail and slow, he carries out his own ADLs, never repeats questions, knows us all, etc. However, although he was with Mom here at home when she died, (both lived/live with me and my husband), he continues to ask about her whereabouts every day, sometimes several times in the same five minutes. He wonders why there is no meal set for her, whether she's coming to bed, etc. When we tell him she's passed, or is in heaven, he does not react sadly, just thanks us for telling him. Then he asks again. It's no good to make up a story; we tried that once and he wanted to get dressed and go out to look for her. I'm hoping to gain some understanding/perspective on this behaviour, not so much for a strategy to change anything. I understand that after 65 years of marriage it's very difficult or impossible for him to disengage from that relationship. Thanks.
Bring dad to his PCP as a start. Look into antidepressants which helped my mom a lot. They didn't stop the progression of the dementia, just kept her happier in general. She was able to perform ADLs for several years before she couldnt, at 92, and always recognized me too.
I'm sorry for the loss of your dear mom, and for your dad's pain and decline in all of this. It's an awful lot to deal with, I know. Best of luck to you.
I am so sorry for your loss and for hers. You don't seem to have a question for us, which is good, because things like this have no answer. Just a sad part of this life transition.