And don't forget to have your blue DVC member ID with you when you go to purchase, along with photo ID (driver's license, etc.) The "DVC Member" notation on room keys is not sufficient to receive that discount.
The perk is available to members and any immediate family living at the same address. So, if there are any members of your family who do not have a DVC Member ID, they will have to show a photo ID which matches the address listed on a member's photo ID.