Hi Jennifer:
I have two young boys who love all the different Walt Disney World parks. Every family has different tastes and preferences, but I'll let you know what works for my family to see if it gives you any insight for your situation.
For my family, we would definitely hit
Magic Kingdom. Among many other things, at the Magic Kingdom, we always ride The Pirates of the Caribbean, The Jungle Cruise, Peter Pan's Flight, Mickey's PhilharMagic, and it's a small world.
The choice for your second park is a little bit harder. For my family, we enjoy
Epcot, where we take in Spaceship Earth, Living with the Land, Soarin', and tour the countries of World Showcase. However, a lot of families enjoy
Hollywood Studios, which features great rides and attractions such as Toy Story Mania and Muppet Vision 3-D. Of course, if your family loves animals, you may want to consider
Animal Kingdom as your second park.
Enjoy your vacation.