Their behaviour towards your daughter, who is an innocent child, is hateful, and to you is totally disrespectful. When a child becomes a part of our family, no matter how, they are just that, a part of the family. You have every right to be hurt. My mother is permanent guardian of a now 5 yr old girl with CP and we have always treated her as though she were an important part of our family. It's a bit different, but if she was my sister's daughter and not my mother's I would behave exactly the same.