If you get in touch with the home, they may be able to help you, but may be reluctant to give you any details. The son himself, if he wishes, may get in touch with the birth mother, but you have to wait for him to make the first move. The home may be able to get in touch with him and tell him that his birth mother is trying to find him. He may not have been told that he is adopted and he may not wish to see his birth mother.