Hi Sarah!
The Disney Youth program is amazing! My boys and I have participated in the
Individual Enrollment classes of the Youth in Education series. That link will take you to a catalog of classes that are available.
It looks like for your kids there is one class that would be available for all (How Things Move), and one additional one for your 6-year-old (Synergy in Science). Families are welcome to tag along, and at least one parent is required. There were even younger siblings that weren't old enough for the class, but walked along with us for the classes.
If you haven't already purchased theme park tickets, you will be offered a discount on tickets when you pay for your class. There are many options for tickets and they are a great price. The website will show you all the options when you check out.
If you have other questions, you can also call 1-877-WD-YOUTH
for more information.
This is a very unique way to learn more about Disney, while at the same time learning about science and technology! I hope you love it! Let me know if you need any more help!