About seven years ago my Dad suddenly started to behave strangely. Not understanding where the money in his pocket had come from. Saying strange things like "when I look out of the window all I can see is grass and trees". When we tried to explain he became angry and agressive and just keep telling us we didn't understand. A few months later he suddenly took my mum hostage with a knife to her throat threatening to kill both her and himself. He was admitted to a psychiatric hospital where they eventually diagnosed him as having Alzheimers. Since then he regularly attends hospital and has MMSE tests. In all these years he has never scored less than 30. There appears to be nothing at all wrong with his memory but his behaviour to aggressive and deeply offensive. He does nothing at all during the day -not wanting to go out of the house and expects to be waited on hand and foot by all. Once a moderate social smoker he is now smoking up to 60 cigarettes and day and will take himself off to bed up to 20 times a day. When he does have any visitors he is always "taunting" them about the bad things that have happenned in their lives. He says things like "I've seen your husband, he's waiting for you". When the husband has died. My sister had a stillborn baby and he is always saying "you're baby's crying - aren't you going to see to it". People no longer visit as they find it so upsetting and my poor old Mum (80) is isolated, frustrated, embarassed and lonley. I can only go on the diagnosis we were given but cannot help but wonder if this really is Alzheimers. I would like some feedback on what other people think.