SOLVED. Children's book, fantasy, pre-2007, possible trilogy, dragon who can be controlled by true name, 3 children with green eyes to see the magical world. [s]

[Lucy]

My local library had a copy that was (I believe) 3 books bound in one copy. There were three siblings but the POV centered on the middle boy who had a green eye and a brown eye. His older sister had 2 brown eyes and his younger sister had 2 greens eyes and they could see the magical world with their green eyes. The dragon could be controlled by it's true name but only 3 times per person. The boy may have hidden the dragon in his treehouse, and maybe the youngest child's name was Alice?? I'm not sure, anybody know?

[Rosa]

The Eidolon trilogy by Jane Johnson? The first one is The Secret Country.

[Lucy]

That's the one!!! Thank you so so much:)

[Rosa]

Wonderful! You're very welcome.