With the recognition that everyone’s definition of classics differs, I’ll offer some we’ve enjoyed. These have all been loved by at least several of my children. I do include fantasy books like the Fablehaven series and my list will have books for older ages mixed in (like Eragon). A few books that come to mind as newer potential classics ( published after 1950):
The Penderwicks series
A Nest for Celeste
The Mysterious Benedict Society (it’s a series, will esp appeal to boys or those who like puzzles)
The Twenty One Balloons (okay it was 1947…)
Fablehaven series
The Incorrigible Children of Ashton Place (series)
Eragon and the rest of the Inheritance Cycle
We’ve also enjoyed Princess Academy series and the Books of Bayern series both by Shannon Hale.
THere are more but those are some we’ve enjoyed enough to give them a home on our shelves (or our Kindles or audiobook collections).