If you were going to the Halloween party with them you’d all be able to enter at 2 pm. However since you don’t have a ticket you can’t enter at all. The benefit was early access to MK with a Halloween party ticket not access with no ticket. If your wife was a full DVC member (ie listed on the deed) she could enter at 2 and take your daughter and granddaughter with her but you said she was an associate member. If that is correct she is not eligible for any of the benefits other than the discount on Annual passes which is given to your household.