how to deal with hallucinations

My dad has been going down hill since November 2015.He has had Parkinson's now for about 5 years, he is now 75.He just had the shakes and slow movements but able to think and take care of himself until November. He started having Hallucinations right after Thanksgiving. The Dr keeps increasing his medicines to deal with the hallucinations but they don't seem to help with the hallucinations, they do seem to help with his anger outburst. My dad now needs alot of help with just daily things, he spends most of his time talking to all of his hallucinations. My dad gets really upset if we don't get extra food to feed his "friends"ect. WE don't know how to handle this. Is this just how it's going to be from now on?