Fireball2: Yes, very astute observation, but he's so frail now it's not possible w/out a very bad outcome. It should have been done years ago.
A verbal ass-kicking.
I'd think about showing up at a doctor's appt with your brother and mother and essentially hold an intervention right there. Explain to the doc in advance what his behavior is like.
Tell your dad he has a choice. He can take some meds that would help with the symptoms that are causing his deep-seated frustration or he can be placed in a home out of concern for you mother.
Then if he has to be placed in a nursing care facility, it was his choice and his actions that lead to it.
Best of luck.
