Mum lives with us and......
I would not advise anyone to make this choice. I was not going to lose the sanity of working as I was already a carer, we had our own selfish reasons for moving as we used to live next to the neighbours form hell. Our old house did not lend itself to being extended and if we had moved Mum to our house she would have been further away form the local shops etc anyway. As it was Mum was eligible to buy her house so we sold ours, bought hers and extended it withb a granny annexe.
Now here I would say even if you have forty two bedroomns if you only have one lounge think really hard, or plan to extend or convert a spare room inot a private lounge for your FIL if you do move him in with you. There is NOTHING as irritating as not being able to watch your programmes, or hold the conversation you are used to having, worrying about tidiness etc because you have a "guest".
On your wife's side I would say this I TOTALLY understand the love and loyalty issue, but your husband is number one. The other point I would make is YOU(Linda) are equal number one and you may be making this decision for your father now but once the condition gets a grip and you can nolonger hold a good conversation, have to cook all his meals do his laundry etc etc, there will be times you resent the input despite loving him - I know! Another thing a lot of dementia patients develop poor personal hygiene and you can not drag them inot a bath/shower, if they have incontinence they may have a bit of a smell too - sad but true. It's very hard to sit with, let alone eat with someone who doesn't smell to fresh. I hate the resentment and tiredness I feel. I would love to feel I am visiting my Mum for quality time.
What if FiL become aggressive, or makes accusations, if you are divided on the issue of who should care for him now then will you be united on other issues? If he starts wandering at night how will you catch up with sleep?
We had a secret ballot when we moved in with my Mum so no one would feel bad if they voted against the move (one no would have meant no move) I'm pretty sure although we all love her dearly if we retook the ote today it would come out very differently. Not because we don't care, or we don't love her anymore but because despite all the books etc none prepared us for how life changing this would be.
When you have a child the dependency (with luck) decreases and thing look brighter, with Alz there is no bright horizon.
So why haven't we arranged for Mum to go into a care home, well legally we can't as she is still judged to have capacity to make decisions over her care and technically although we pay the mortgage and used the money for hte sale of our old house to move here it's her house. Emotionally she isn't really ready and neither am I, fortunately I have a wonderful family who are not pushing me in this way. Lastly I promised my Dad I we would look after her - though I know if he were able to tell me so he would say it's ok to give up if I can't cope.
There is a definite effect on my health. At a time when I was hoping my children are older and I could go back to work I am stuck caring again.
We all have to make the choice we feel is right, for us our partners/children and other loved ones. Just make sure you do it with your eyes open. Good luck.