Shades of Green attractions office is currently at the Contemporary Resort, North Garden Wing, 3rd floor, Room 7346. They can sell you discounted Disney tickets, as well as discounted tickets for most attractions in the area. There is a spreadsheet of all the prices posted on their website. You can also call for information (407) 824-1403 or toll free 888-593-2242 (although I usually have a LONG wait when using the toll free number for some reason). Military folks can buy discounted tickets for anyone in their party, even if they're not military--so they can buy your passes. We do it all the time.
That said, they may get better deals for being Florida residents. A FL resident annual pass is $299, although it is slightly discounted at the Shades of Green office as well! That may make sense for your relatives if you're staying many days or will make repeat trips. Resident tickets are only available to people with a valid FL ID or driver's license, or military ID based in FL--so good for your relatives but maybe not for you.
Each eligible person (military/govt id, active, guard, or retired) may reserve up to 3 rooms at Shades of Green, or whereever they're putting their guests. (So I can get 3 rooms, DH can get 3 rooms, etc.) In January the new SofG won't be open so they were putting folks at the Comtemporary and a few other spots. If they have no Shades of Green rates left, ask for overflow rates at other resorts. These may or may not be better than FL resident rates, so be sure to check both! In my experience, FL resident has always been the best rate, except for the Shades of Green at the Contemporary during construction. (In December we have 9 rooms...the first 6 at FL resident (DH and I were allowed 3 each) and 3 at the Shades of Green overflow rate...all at AKL. FL resident was $109 +tax, SofG overflow was $124 +tax).
HTH! Let me know if you have any other military/Disney ?'s!
Katie