We haven't done it yet but are seriously thinking of offering to have my in-laws to live with us as they get increasingly needy. It would require us to move to somewhere suitable so not a speedy undertaking. Has anyone experience of this? I'd love advice or to hear how it worked or otherwise. We are in our 70s so perhaps this isn't a common arrangement.
I think you would need to buy a property with a flat or bungalow attached where they could still live independently. You shouldn’t cut off any help they already get. I don’t like to mention it, but we are all getting older. You don’t know how long you would have to look after them nor do you know how long you would be able to look after them. Elderly people don’t always cope with moving house / district. It might be better to explore what other help they need that can be provided where they are.
After my MIL died, we did consider selling FIL's home and buying a larger house, so that he could live with us, and our two children. This became an issue when inheritance was mentioned, and the other two siblings would be wanting their share. We would have had to sell to find the money. It never got nasty, just involved. So it never happened. Turned out OK in the end, as FIL's older grandchildren took it in turn to live with him. They had a safe place to live while saving for their own places and FIL had company with people he loved.
Please consider how you would feel if your husband pre deceased his parents after they moved in to live with you. Could you cope with your own loss and theirs? I only mention it because it happened to a friend of mine. Her in laws made her life a misery after her husband died suddenly and eventually she had to 'evict' them.