Hi Kimberly!!
Thank you so much for the direct question!! This is such a sweet, sweet gesture by your granddaughter!!! I definitely have a couple of great ideas for some special events to do with her brother, sister, and cousin that she can use the money that she has saved!!
The very first thing that came to my mind was the
Pirates and Pals Fireworks Voyage!! It is $30.99 for children ages 3-9 and $53.99 for ages 10 and up. This cruise provides a wonderful view of Wishes from the Seven Seas Lagoon and is preceded by wonderful snacks and treats. There is also a character meet and greet with Captain Hook, Mr. Smee, and Peter Pan! I went on this in February with my four year old and he absolutely loved it (as did I!!!)
Another idea that came to mind was doing
Disney's Family Magic Tour at the Magic Kingdom. Almost all of the Tours and Experiences at Walt Disney World have an age limit, but this tour accommodates all ages. It is $34 per person (regardless of age) and is an interactive tour throughout the Magic Kingdom searching for clues to help save the Magic Kingdom from a Disney Villain.
One last suggestion would be to visit
T-Rex at Downtown Disney and have everyone Build-A-Dino!!! This would allow everyone to come home with a wonderful, customized keepsake from your wonderful Walt Disney World Vacation!!! My son recently did this for his birthday and he had so much fun!!!
Please let me know if you have any further questions about any of these suggestions or just any other questions in general!!!
Have a very magical day!!!
Scott