Homeopathy for parkinson?

Hi
my father has Parkinson. Also he has serious problem with his memory. He speaks with difficulty and he express himself with wrong words. When it wakes up it tangles the dream with the reality. The dementia problem is much worse than tremble or dyskinesia.
psychologically history: his wife-my mother had died from cancer, terrible loss for him, then he lost a lot of money from stock market. After he started to has parkinson. He doesnt fight for his disease. He argue everytime i give him medicines or i find him a therapy. He lost his interest for life. He thinks he is old and dying.
Which homeopathetic remedies shall i give him?


thank you very much