My MIL was diagnosed with mixed type dementia 4 years ago. She has completely changed personality becoming aggressive and argumentative. She is constantly moving and hiding things which is causing a lot of distress to my FIL. Unfortunately my FIL seems incapable of understanding her illness and constantly questions and argues with her. He thinks she deliberately hide his possessions and does the opposite of what he says and he takes her behaviour personally. When we try to explain and defend her he then argues with us. She is still dressing and washing although not showering everyday. She can do very little around the house anymore but continually tries to. She is burning cooking and mixing up ingredients but can’t be stopped from attempting to cook. She hides food in places like chest of drawers which the FIL finds later and this is another flash point. He has told us he has had enough and doesn’t want to look after her anymore. My husband and I work as do other relatives and so cannot step in. She has refused carers in the past and doesn’t want or currently need help with personal care. She is very confused and has no short term memory, she forgets things from 15/30 minutes ago. She has started to talk constant rubbish about the house being left to her my a lady she used to care for which never happened or that the police have told her no one can park outside her house which hasn’t happened. She is destructive with things in the house. She has keyed our car when we were visiting her and this week smash a tv by knocking it to the ground in her conservatory. She denies all knowledge but we know she can’t remember doing it. This is the opposite of how she used to be. She was placid loving and caring. My FIL wants her in a care home but she still has very lucid moments and I think she would be very distressed. We are very disappointed in his attitude to her but can’t deny her behaviour is challenging. We love her dearly but she seems so unhappy we wonder whether being in a care home would be better for her. Any advice ?