I do know of one property in our village, which was actually owned by the daughters not the mum .
only found out in casual conversation with one daughter, who explained that they’d “bought the property” from mum some years previously but (of course) she continued to live there…
This would have been legally done through their Notaire… and might be a solution for you.
EDIT: Did you ever take legal advice as per another of your threads…
Lawyer marriage contracts, inheritance