I love Lindgren for how she packages profound life lessons in children's books. Ronja is a masterpiece so is
"The Brothers Lionheart" by Lindgren. It's one of her most profound and perhaps most philosophical children's books.
Some good children's book recommendations from Erik Hoel: https://www.theintrinsicperspective.com/p/books-to-stoke-the-soul-of-a-young
I would add to the list Seacrow Island and Ronja by Astrid Lindgren.
What are your favorite off-the-beaten-path books to read to your kids?
Discussion
Books that appeal to both kids and adults are really rare and special. I haven't read Lionheart, I'll look it up
Be prepared - even adult readers find it deeply affecting. I still have to cry every time I read it.
It’s known for its unique approach to discussing difficult topics like illness, death, and heroism in a way that is accessible to children.