Hey, Gundark, enter the Dragonfly is a bad choice. There hasn't been a really good Spyro since Insomniac let it go.
See what I mean.
For a good platformer for kids, I suggest Mario Sunshine. It's a Player's Choice now, so you can probably find it for less than 20 bucks.
Also you could consider I-Ninja, Sonci Mega Collection, Wario World, Spongebob Battle for Bikini Bottom, Tak II: The staff of dreams, Finding Nemo, and Fairly OddParents, breaking the Rules.