Responses
Rather than saying he is not interested, I'd say he is kinda traumatized by the shadow it casted on his teenage years. He wanted to run away at all costs, he worked 2-3 jobs, studied well to get in a good but far away uni just to avoid getting mixed up. So unless something drastic happens that either gets him cornered or he gains enough self confidence to shut up anyone talking smack about him, he won't take an initiative to inherit the group. Besides he has a very bad relationship with his father so I doubt he'd want to follow in his father's footsteps.
Is there a possibility that he gonna change his mind and inherit his father 'business' ?