Has anybody had any luck with getting there loved one to stop obsessing about somebody stealing there belongings. My mum is obsessed with thinking that the lady who lives above her is breaking into her unit and stealing things, ranging from money, clothes, medication, and even utensils . It is causing my mum a lot of anxiety. She even thinks that she has taken out the screws on her wardrobe to remove the doors. Most things she has lost, I end up finding them, hidden somewhere. But mum will not listen to reason or logic. What she thinks is what has happened , and there is no changing her way of thinking. Any help on how to stop this, or deal with this would be much appreciated. She is 79 , and lives on her own.