Hi Jo! When it comes to WDW, you can't go wrong with all four parks! Every park has something great for everyone. Also, your children's ages are perfect for the most Magical place on Earth. Since I don't have a lot of details, I would recommend you check out all the
attractions at all 4 parks and decide where you must go, depending on what their interests are. If I had to choose two parks, I would say
Magic Kingdom and
Disney's Hollywood Studios, because both have so much for their ages that there will be tons of fun and entertainment to last a whole day. Of course, if they're really into animals, you cannot miss
Animal Kingdom, or if they're really into culture and technological innovations, then
Epcot is a must. And, if you're staying long enough, you might want to check out the
water parks as well! Have a magical, Pixie dust filled trip to WDW!