Bed sores are caused by lack of good care, the nurses should have been turning him every so often and he should have not been laying on that bed sore also known as pressure ulcers or decubitus ulcers, if left unattended they can go right down to the bone.
I'm sorry this happened, it's more then terrible that your brother had to suffer like that. My condolences on your loss.
I am shocked to see these pictures and to see the brief description you gave about what happened to your brother. This is very sad and my thoughts go out to you and your family. This should not have happened, it should never have begun. It should never have been allowed.
Were all I could really find on the aforementioned test-types. I don't know what to say about this.
Unless I read it to quickly - are you saying this happened in the States and that it began when you were CHILDREN?
I have a TON of questions.....