Dude needs to stop showing up at school if he wants to win any appeals

He is not the person to challenge this due to his behaviour as well as his family's history with the legal system. This is unfortunate because any good argument is now intertwined with him and will make people dismiss any legitimate point he may have.

You can’t discriminate against someone based on them being related to others who have been involved in the system. That would never hold up in court.