Heh, that reminds me of an episode of Supernanny, where a deaf mum had kids that could all hear and speak normally in english. Her daughter basically took control of managing the young troublesome boys (rather cute girl too). The girl had a rough grasp of sign language, but she seemed to be signing english words, and spelling them out if she didn't know the sign for it. I guess she was using "english" sign language rather that "standard" sign language.