Hi Ive just joined here. My Dad has not been formerly diagnosed yet but he is definitely showing a lot of symptoms and just this morning got aggressive for the first time towards my mum. He is convinced she's having an affair with the man across the road and even went over there at 6.15 this morning to tell the mans girlfriend. He is threatening to go over there later to beat him to a pulp. My dad is 83 and also convinced my mum is trying to poison him and has for a few months now, refused anything she prepares for him unless he watches over her during the prep. He has been verbally abusing and making accusations mainly in the early hours of the morning but then seems normal during the day, but for the first time today I've listened to him quite matter of factly tell me what my mum has been up to for years. He is in total denial and blames my mum for everything. Mum doesn't feel comfortable on her own with him and we're worried he will carry out his threat with the man across the road. What on earth do we do??? All we've managed to get so far is the promise of a phone call from a Doctor tomorrow