I have a son who stutters who dreams to become a doctor one day. Nothing will hold him back. Yes he stutters and owns it. He goes to therapy. I make sure I advocate for him. Why can’t your brother also pursue his dreams? He can get help in form of therapy but ultimately if he is good at what he does, he will be fine. My son and your brother will always stutter but their stutter should not define them and their paths in life. As far as college and studies are, get accommodations.