Mom is 83, lives alone in own home with assistance from me and a dtr-in-law. She puts on a good act with other people and her doctor so they think she is "of sound mind." We take very good care of her, but in some instances, she will say things to other people that I know they are thinking otherwise. How do we get her to stop doing this. I've called her out on her untruths, and she seems to be contrite, then the next time we are with someone else, will repeat the lie. What to do?