Rose Pink -
My father was very independant, controlling, and private. As my Mom sank into AD, he disguised her failings and spent all his energy and time trying to care for her. 4 of their 5 children lived out of state, had careers and made their Sunday phone calls to the parents who used a speaker phone. She would sometimes wander off and neighbors would call or he would find her banging on their doors, lost and confused. But then she told the water meter reader that some man in the house was trying to kill her. 8 or more local cops appeared, mainly interested in what was in his house and where did I live (not there). And I had to then become very involved in her care.
Eventually, she needed the care you seek for your FIL. I needed to make sure that my father would not bring her back to the house once she was moved to a nursing home. I could not recreate the 24 hour a day care which I had in place for those past 12 months.
IMHO, know in your own heart, that you can not bring him back to your house ever again. Plan on spending 20-30 minutes in the early AM (most alert time for many) and return around lunch for 15-20 minutes. Afternoons are much less productive for visiting. And the staff should have them settled down BEFORE sunset.
As I was the only child around, I realized early on she did not know who I was. She was scared of me and telling her my name did nothing. But my line became, "Hi Mom, it's me, your favorite daughter" immediately made her happy and had her trying to engage me. Their world becomes very small. Be prepared for monologues on your part and talk about things in the family history (funny stories worked well for my mom). This all mentally tires them out. And conversations requiring a decision - leave the room; choices are impossible and unsettling for them now. Also multiple people talking raises anxiety levels as it is very difficult for them to figure out where all the voices are coming from or what they are saying.
I was the only one who could physical transport my Mom outside of the nursing home. Dental surgeries (extractions needed from falling out of bed) and the hair salon (the nursing home's professional was highway robbery and a cat groomer could have done better). She spent her last 16+ months living there and I took her to the beauty salon just 2 weeks before she passed away. She was 21 when Pearl Harbor occurred and she finally got a job. But due to the war, about the only thing she could spend her money on, was getting her hair done. She still had that love of being fussed over. And most times after that, I would take her inside Friendly's Ice Cream and she would just watch the kids at the surrounding tables, saying "baby; oh, baby" as she ate some ice cream.
Funny Story: While Mom was still at home and 21 months before her passing, my RN nurse sister came home for 3 weeks to help my dad. One afternoon, she and the LPN decided to take my Mom to the hair salon and follow it up with the ice cream. 2 of them; 1 95lb 78 yo old lady. Mom screamed and beat on the glass all the way to the salon. Was upset and lashing out in salon. Getting her back into the car, she kept refusing. Sis and LPN decided to forego the pleasures of taking her inside a public dining room for ice cream.
When I showed up at the house, both of them blasted me for subjecting them and Mom to this total insanity of getting her haircut. I am thinking, "Mom likes this trip; what were they doing to upset her?" Replay in my mind what I do. OH! "Did you tell Mom that you had to make sure her seatbelt was tight before you could start the ROLLER COASTER? Did you make roller coaster screams and ah's as you went around cornors and over & down the over pass?" My Mom loved roller coasters in her youth - she still loved them somewheres then, too.
