My older bro needs help!!?

You are right your brother does need help. i think the best way you, his family can help him is by just sitting down and talking with him. Have you ever seen the show Intervention, well you need to have one of those. Get your brother to sit down with you, his girlfriend, your mom and whoever else could help. Explain to him how concerned you guys are about him and how much you love him and want him to change. He should see that you guys love him and want the same thing you all want for him for himself.