Thanks for the information. It sounds like they may try to put us up at the Hilton with business class tickets and my son somewhere else. Do you think there is any way we can persuade them to keep us together (preferably at the Hilton!)
Just ask. As long as it isn't going to be an extra room for them (you would be entitled to 2 rooms at the Hilton anyway), I don't think there would be a problem. You may have to pay for his meals at the Hilton, but otherwise should be straightforward.