I'm glad to hear that your brother can rationally see what he does and how it affects others. Good sign of maturity and self identity too.
How heartbreaking to see your dad struggling as he is. I remember my mom going through the same thing. After awhile, she got to the point where she wouldn't or couldn't speak at all. I think that was the hardest part of her illness for me to handle. So I made sure I did enough talking for the both of us....LOL.
(((( LMo )))) if ever you want to vent, feel free to pm me. I am always available and have strong shoulders and good ears
Take good care of YOU hon.

sabby