Suicidal brother

He’s 32 , loner type of guy, handsome and works out, but no job no real friends and lives at home. He might be autistic. Definitely has extreme adhd if not. Super functional and normal when I bring him around my friends. He traveled the world alone avoiding his problems. Blames my parents for his life. It’s hard for me to feel empathy for a man who doesn’t work and blames his parents. But then I go back to feeling bad because I know he’s lonely and lacks in any real connections and confidence. The family dynamic is pretty neurotic and avoidant but there’s lots of love. My dad is an immigrant who doesn’t get involved anymore and my mom is probably involved too much. I’m the younger sister and I feel like I am responsible for him not killing himself and idk what to do anymore.