The Bone games aren't just for kids, but they're definitely age appropriate.
Out from Boneville review
The Great Cow Race review
Both games can be bought as downloads or on CD from
Telltale's online store.
Also, at that age I loved the King's Quest games. They're quite dated now, and I could see the text parser being frustrating, but there are a few remakes with updated graphics and a point & click interface that would be great for kids of that age.
King's Quest I
King's Quest II
King's Quest III
