I agree...YOU DON'T have to do anything about HIS PARENTS TRIP...just let him take care of it...
You know you keep saying you don't want them to know, you hope he hasn't told them...how foolish would you feel if you called and made the excuse you couldn't go and he had already told them???....just let it be...if they call....deal with it gracefully by saying "Oh...I thought H let you know. I will have him give you a call." Then leave a message for H that his parents called and would like him to return the call..remember he is a big boy...let him be responsible...
