Don't lose hope - not all parents are like that. They don't know it, but they are doing their son a major disservice. I'm not a teacher and so I'm not sure about the heirarchy and/or chain of command, however, I think that as long as the principal is behind you .. you are OK. If I were you I would want to have someone who is in charge or responsible to take over what happens with this child. You should not have to deal directly with him for the remainder of the year. I don't know if that is possible or not.

The school year is almost over. Hopefully you can hang in there until the year is out.