My mother is having delusions that a member of our family has come into the house and taken her things. This is getting worse every day. For example, she looks in the closet and thinks all her clothes are gone. When I try to show her everything is there, she says it's not what was there before. She also sees things that aren't there. I try really hard not to try to reason with her or show my frustration, but I'm not doing it very well. How have others coped with this behavior?