I don't mean to criticise, but if your Dad is 67, has had these dreams all his life, and they disturb him so much, why hasn't he looked for help before now? Maybe they bother you more than they bother your Dad, and you are upset on his behalf? If so, you maybe need to focus more on how your Dad feels about it - does he really want to go through with all you suggest, or is he doing this because you think he should?
Please don't be upset at my suggestion - I know that you mean well - but it is strange that your Dad has reached the age of 67 without seeking help.