Welcome to talking point. Sorry to hear your dad had to be taken into hospital its hard isn't it. Yes from what i've read & seen (not an expert) aggression is quite common. This was the main reason i could no longer cope with mum's care (apart from lack of sleep) . It was also one of the main reasons they decided mum should remain in hospital as they didn't think an emi care home would cope.Though there are other factors with mum & problems with her being given medication . I'm not suggesting your dad will not be allowed home after treatment .While he's in hospital they can assess him properly to find out if there is any other underlying cause , such as pain, infection etc. Has your dad been prescribed any medication for his aggression what have the doctors said?There are drugs that can help to control & ease it. With some people its a phase in the illness & doesn't last. Hope he improves soon. Keep posting if you need support. Hang in there.
Just wanted to add that i'm not suggesting drugs are the only way to deal with aggression , but when other attempts to comfort & calm have failed they can really help both patient & carer. As long as they are properly managed.