My addition is not meant to replace any of the good points above but suggest an additional point for consideration.
My suggestion is find a community resource (community counselor, non denominational chaplain, Mainline Protestant Pastor) who has advanced training as a professional crises counselor to connect to the father.
This is a very sad story and the father is going through considerable suffering in his blindness and disability. My experience with people in similar situations are that their problems compound greatly. Sleep patterns become disrupted, social isolation increases, general depression and loss of purpose.
He lives in a dark world and a cell of isolation and is now losing what may be the last person he has a connection to.
A skilled counselor can listen in a non judgemental way and start to unwind the misery that now engulfs him. Not expecting a miracle but the right connection could create an opportunity for him to put down the pain and fear that he carries. Any improvement in his father's mental health can only have benefits for his son as well.
Good luck and best wishes to all involved.
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