Hi Lynne,
Welcome back to the Disney Parks Moms Panel! These are great questions and I hope the information I have will help answer them for you. I was able to try out Memory Maker when I was traveling with a big group in December and I absolutely loved it! One of my favorite things about Memory Maker was that it was so easy for everyone in our group to add photos, even when we weren't all together. I'm happy to report that everyone in your travel party will be able to use their Magic Bands (or a linked Disney PhotoPass card) to collect photos as part of your Memory Maker. Just be sure you have everyone linked together as Family & Friends through your My Disney Experience account before you leave home and you should be set. I'm guessing you're seeing the Memory Maker on your account simply because you're the entitlement holder.
In terms of the participating attractions and dining locations, here's the most recent official list I was able to find. This came from the
Disney PhotoPass Service Facebook page. However, keep in mind that Memory Maker is still relatively new, so new locations could be added at any time (or already be participating), so my best advice is to ask a Cast Member at spots not listed below if you're unsure.
Attractions: Space Mountain, Splash Mountain, Buzz Lightyear’s Space Ranger Spin, The Twilight Zone Tower of Terror, Rock ‘n Roller Coaster, Expedition Everest, Dinosaur, Test Track
Dining Locations: 1900 Park Fare, ‘Ohana, Spirit of Aloha Dinner Show, Chef Mickey’s, Tusker House Restaurant, Hoop De Doo Musical Revue
Wishing you a most magical vacation, Lynne!
Beth