If ALL of them are under 18, they can't really enter legally binding contracts. So even if they ever did make any money at this, its probably going to end up with the organizer keeping all the money and you having no way to extract said money from them.


RUN AWAY.

Be polite about it that you do not have time to work on this project and are bowing out. They give you grief: IGNORE THEM. Politely reiterate you are bowing out and do not have time for this.