For the younger ones:
Peter Pan
Through the Looking-Glass and Alice's Adventures in Wonderland
Winnie the Pooh
Pippi Longstocking
The Hardy Boys
The Famous Five and The Secret Seven, etc

For a little older:
The Little Prince
When Hitler Stole Pink Rabbit


Later still:
The Three Musketeers
Pride and Prejudice
To Kill A Mockingbird
The Bone People (NZ book)
Madame Bovary (hopefully in French, if Tim & I have done a proper job re education. )
Crime and Punishment
Anna Karenina

So they have a proper grounding in literature since so many works reference these:
The Iliad and the Odyssey
The Aeneid
Metamorphoses
Decameron
The Divine Comedy


There are so many more, though. So many. Hopefully by the time our darlings are old enough to read for themselves we'll have a well-stocked library for them to devour.