In the blink of an eye, all children are helping their parents prepare for their trip. Only the baby will accompany the mother and father. The remaining 7 children are hurredly given their assignments and their mother's promise to "give them a dinner [they] won't forget in a hurry" when she returns. To find out what happens while their parents are gone, you can download the story (free) at Homeschool Freebie of the Day. While you are there, take a look at the other wonderful resources available to download throughout the week of Thanksgiving.
When you've printed off your copy, have your children illustrate parts of the story and put it in a binder or have it comb-bound so you can revisit the story each Thanksgiving. After you've read the story, you can treat your family to watching the movie. That's another tradition I look forward to starting (when I get my copy!).