You seem to have a bit of an attitude towards doctors, imho. Just my observation. "quacks?", yet you are upset with your mother about your brother. That is her child, not yours. If she sent him to a neurologist, I think that was the best she could do. I think it's fine you suggested it once, but it is not your responsibility to go further, I'm not trying to upset you, but possibly you should release yourself from this burden you feel to try to help your brother? Also, being overweight is not what causes type 2 diabetes. It's fluctuating the amount of food, from too little at a meal to too much at another. Best wishes.