I'd have to agree with Magickal. Your brother respects no one and sounds as if he cares for no one but himself.

I know my dad is somewhat like yours. My dad had a good education and a good job and all. But people that grow up in the country are much different than those in the city. Like I've learned that work is more important to those in the country than those in the city. City people are more concerned with looks and cleanliness and what people think. Country people are less concerned with some of these elements. You see, my dad did not shower every day. Actually his hygiene was very poor. A lot of people called my dad names and looked down on him for his poor hygiene. Even his own children. But I never did. I disregarded all of this because my love for him was greater than that. I loved him unconditionally...and respected him greatly.

I think reminding your dad of your love and acceptance of him would help him out. It may not be a replacement for your brother, but it will cheer him up.