My 92 year old BIL is looked after in his own home by carers. They have recently asked me to make an appointment for him with his GP as they believe he has the onset of dementia. What benefits would there be for him if he has a definitive diagnosis? How will it help him, or is it something to do with benefitting the carers? He is housebound so the GP would have to visit him at home, what tests would they carry out? He is very confused (although has periods of perfect lucidity) and has started asking where his mother is and what has happened to his brothers and sisters (they have all passed away sadly) Will a diagnosis help in any way at all or would it be better to just leave him in peace as surely these things are expected at his advanced age?