Is there anyone else I can go to?

I posted on here a few months back about my brother who was adopted as a baby. He is now 21 years old, and still lives with the family. My problem is, the house is run down and filled with drugs. I know this because his foster mother allowed my mother and myself to visit him over the years. My brother dropped out of school, got in trouble with the law, and in Dec. was involved in a car accident and now has brain damage. I am very concerned about him because now that he has a lawsuit from the accident, and is unable to work because of his condition they are getting over on him. My mother visited him a few weeks ago and had to take him shopping for everything from toiletries to new shoes, because they haven't bought him a thing. He has no income coming in, because no one in the house has a car to take him to apply for disability. He has a prepaid phone that they control, and when he runs out of minutes they put the money on when they feel like it. I called the NY state dept of social services and spoke with two caseworkers. One was his caseworker when he was a minor and claimed she never met my brother. So this means that since birth not once has she bothered to go to the house to check on his well being. I spoke with another caseworker in the adult abuse dept. and all she said was since he's 21 he can make up his own mind about leaving the house. This is not true, because of his injury he is constantly changing his mind about things and forgets things all of the time. She also said she went by the house and all she said about that was she's seen worse. The house has a bathroom floor that's about to collapse, roaches everywhere, no food in the kitchen at all, and empty beer bottles, and marijuana roaches greet you at the front door. My brother couldn't even shower because of the condition of the bathroom. He had to call up his foster sister who lives down the street to ask her if he could come over to shower. I have not been able to speak to him in over a week because the foster family has disconnected their house phone, and his phone is out of minutes. By the way, his foster mother is in her 80's and is in poor health. There isn't anyone in that home capable of taking care of him. What else can I do? I want my brother OUT of this house. I cannot believe how unhelpful these people are being and I would like to know if there is someone higher than they are I can speak with. I thought if I spoke with the adult abuse department they would have him removed from the home, but I feel like they could care less.