I'm not an expert on this, but I believe the people who live near the parks and/or have APs said that if you use your family's/guest's tickets for quests, the family member/guest must be at the VMK Central desk with you. So, you cannot take the tickets for your group of 10 and get 10 sets of quest stuff. All 10 people in the group have to go in.
When I go with our group of eight in December, I plan to bring all eight of us in there at once, just to flood them. I know it's spiteful, but I think this rule is ridiculous.