What is a good piano course book for kids?

I’m looking for a good book to use to teach my five and seven year old children piano. I am classically trained, but would rather have them learn by chord progression. I want them to enjoy more creativity and get more enjoyment out of it than I did as a child. I kind of like the Usborne Piano Course, but it’s hard to find. What else can you suggest?

Hal Lenord is good.